Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant's customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. As an Amazon Associate we may earn from qualifying purchases. We may receive a commission from purchases made through links on our site, which will help us continue to provide you with value.
Best Choice Haobase 
Haobase 6 Pcs Fish Tank Aquarium Red Clear Plastic Air Pump Check Valves Material: plastic.Yotsuba 
Check Valve Fish Tank Aquarium Air Pump Silicone Non-Return One Way Airline A Non-Return Check valve is an essential accessory when setting up an air pump for your aquarium. Due to gravity water wBest Value LT Easiyl 
LT Easiyl Pack of 5 Check Valve Hose Barb One Way Inline Check Valve Plastic Check Valve Non Return Check Valve for Fuel Versatile Functionality: Designed as a unidirectional check valve, this product effectively prevents reverse flow, maintLexziuo 
Lexziuo 1PCS One Way Check Valve for Aquarium Air Pump - Plastic Anti Backflow Valve Prevents Water Overflow, Easy Insta Universal Compatibility - The Lexziuo 1PCS One Way Check Valve fits standard 4mm-6mm airline tubing, making it compatiblAquatopia 
Aquatopia Air Clear Check Valve (AQ81808) Check valve is used to stop air pumps from back siphoningPYPABL 
PYPABL Aquarium Air Pump Accessories Kit, 1.5M Standard 4mm Air Tubing, Check Valves, Air Stones, Suction Cups, Regulati [All in one package] Come with everything you need for one aquarium air pump: 1.5M/4.9ft air tubes*2, check valves*2, aiECSiNG 
ECSiNG 4Pcs 6mm One Way Check Valve One-Way Air Water Gas Check Valve Plastic One Way Non Return Check Valve for Water T The check valve are made of plastic material, durable and compact, it can prolong the product service life.eMagTech eMagTech 5PCS 3/8 Inch (10mm) One-Way Check Valve 43.24x20.2mm PP Non-Return Check Valve for Water Fuel Oil Air Gas Pneu Size: The dimensions of this 3/8" (10mm) non-return check valve are 43.24x20.2mm. Perfect for ensuring smooth and efficiEZONEDEAL EZONEDEAL 5Pcs Aquarium Check Valve, One Way Non-Return Valves for Aquarium Air Pump, Check Valve for Airline Tubing, Fi Flood Prevention: Designed for aquariums, our non-return check valves act as a shield against potential flooding, offeriEsforzarse 12Pcs Aquarium Pump Protectors, 4mm Aquarium Air Pump Accessories, Fish Tank Accessories for Air Pump Line, One Way Non- Packaging Content: You will receive 6 pcs one way non-return check valves and 6 pcs control. Providing ample quantity foEsforzarse 12Pcs Aquarium Pump Protectors, 4mm Aquarium Air Pump Accessories, Fish Tank Accessories for Air Pump Line, One Way Non- Packaging Content: You will receive 6 pcs one way non-return check valves and 6 pcs control. Providing ample quantity foBe In Your Mind Be In Your Mind 2 Pcs 1/4'' Female Threaded Brass One Way Air Check Valve 40mm Hexagon Non-Return Pneumatic Air Check Va [Versatile Hexagonal Valve] Ensures unidirectional flow: Fits 1/4-inch internal thread, 40mm long, with an 11.7mm innerFlutaire Standard Aquarium Air Pump Accessories Set, 13 Feet Airline Tubing with 5 Air Stones, 5 Check Valves, 5 Control Valves, [All In One Package] No Worry About Mismatching - Complete air pump accessories of airline tubing, air stones, connectorArmastuse Armastuse Aquarium Check Valve,10 Pcs One Way Non-Return Check Valve,4mm Aquarium Air Pump Accessories(Red) Material:The Oxygen Pump Check Valve Is Made From High-Quality, Durable Plastic, Ensuring A Tight Fit To Your Hose And ETopHomer TopHomer CO2 Stainless Steel Check Valve, 4mm Diameter One Way Non-Return Check Valve Anti-Backflow Maintenance Accessor 【High-Quality Material】The one-way water stop valve is made of high-quality stainless steel, which is durable and corrosEVTSCAN EVTSCAN 3-Port Brass Male Threaded Air Compressor Check Valve Central Pneumatic 90 Degree Size 0.8x0.7x0.4 in Easy to in This Check Valve is Male Thread 90 Degree,Size: 20*19*10mm/0.8*0.7*0.4in used for Air Compressor.Loopunk Black Air Pump Check Valves, Fish Tank Aquarium Clear Plastic Check Valves(15 Pcs) 【Features】Non return air pump safety valve, an essential accessories of pump, Protect you air pump by preventing aquariuECSiNG ECSiNG 5Pcs 4mm 6mm 8mm 10mm 12mm One Way Check Valve One-Way Air Water Gas Check Valve Plastic One Way Non Return Check The check valve are made of plastic material, durable and compact, it can prolong the product service life.ECSiNG ECSiNG 4Pcs 8mm One Way Check Valve One-Way Air Water Gas Check Valve Plastic One Way Non Return Check Valve for Water T The check valve are made of plastic material, durable and compact, it can prolong the product service life.Taicols Taicols Standard Aquarium Air Pump Accessories Set, 314.96 inch Airline Tubing with 4 Air Stones, 4 Control Valves, 4 Ch 【Packages and Size】You will get 1 set of air pump accessories, including 8 m/314.96 inch long aquarium oxygen hose (canSpacnana 3 Port Brass Air Compressor Male Threaded Check Valve Tube Connector Tool Air Compressor Check Valve for Pneumatic Syste [High Durability] - Compressive strengthLT Easiyl LT Easiyl 8Pcs 3mm 4mm 5mm 6mm Plastic Lnline Check Valve Set Oil and Ozone Resistant for Water Fuel Gas Liquid Air Fish HIGH QUALITY: The check valves are made of high quality resin, thermally stable, can withstand high temperatures up to 1Bettomshin Bettomshin 2Pcs 3 Way Brass Air Compressor Check Valve 20x16x10mm Male Threaded Pneumatic Accessory 【Size】3 way;Thread Size:20x16x10mm;Model:Direct connection;Material:BrassCreate idea Create idea 2Pcs 6mm Quick-Plug Type One-Way Check Valve Flow Pneumatic Check Valve Air Compressed Check Valve Connector [Efficient Design]Compact 53x12mm size with a 6mm straight-through one-way valve ensures optimal gas flow. Ideal for SPUSING F LTD SING F LTD 20PCS One Way Non-Return Check Valve Aquarium Air Pump Accessories for Fish Tank Fishing Tackle Shop Air Line FUNCTION: Protect you air pump by preventing aquarium water from back siphoning during a power outage.eMagTech eMagTech 10pcs Aquarium Air Pump Check Valve Fish Tank Water Flow Overflow Check Valve Outer Diameter 5mm Length 36mm fo The inner diameter size of the one-way check valve is 3mm, the outer diameter is 5mm, and the total length is 36mm. AppleMagTech eMagTech 30pcs 4mm Air Pump Check Valves 43x13mm Suitable for Fish Tank Aquarium Black Product size: The product is 43mm long, 13mm wide, and 4mm in diameter. Manual measurements, please allow slight errors.Sutinna Male Thread 90 Degree Brass Check Valve, Air Compressor Check Valve, Brass for Central Pneumatic Industrial Use Air Comp brass material, high strength and durabilitySENRISE One Way Valve SENRISE 1/4" Hexagon Non-Return Check Valve Brass Pneumatic Air Check Valve for Water Petrol Diesel Oils ( Brass Material: The valve body is cast with brass, making it healthy and environmentally friendly, as well as explosion-SG Store SG Store 3Pcs 12mm Transparent Check Valve with Spring for Water Fuel Oil Air Gas Product Dimensions: This product has a 12mm connector, 22mm width, and 63.1mm length. Manual measurements are provided;Joyzan Air Compressor Check Valve, Check Valve Spare Parts Tube 3 Port Brass Male Threaded Tube Connector Tool 90 Degree Right Safety Design: Fast and easy to install, does not require any tools. All the corners and raised sharp points of this proWANGCL WANGCL 10 Pack Aquarium Air Pump Check Valve Aquarium Accessories Fish Tank One Way Non-Return Valve When pump put the position below the surface to prevent water back damaged the front air pump or other products equipmenAIMALL AIMALL 2X 6/8/10/12mm One Way Non Return Check Valve Air Fuel Petrol Diesel Oil Vacuum - Ideal for Automotive & Marine 🚗 Enhanced Fuel Efficiency: Designed to prevent backflow, ensuring fuel stays where it needs to be for efficient engineHyuduo Check Valve, One Way PVDF Strong, Wear Resistant Durable, One Way Non Return Check Valve Air Pump Accessories Water Stop Wide application: check valves widely used in auto parts, machinery industry, home appliances, , water treatment, air puLxcshLjx LxcshLjx Standard Aquarium Air Pump Accessories Set, Fish Tank Accessories, Standard 13 Feet Transparent Airline Tubing, Aquarium Air Pump Accessories : Our Aquarium Air Pump Accessories, suitable for Aquariums, Fish tanks, Fihydroponic SystBE-TOOL BE-TOOL Check Valve Compressor Check Valve 3 Way Air Compressor Valve for Direct Air Compressor (Male, 1/2" x 3/8" x 1/8 Made of brass for higher corrosion resistance than steelCryfokt 5Pcs Stainless Steel One Way Check Valve, Proof CO2 Check Valve, Lightweight Fish Tank Check Valve, Easy to Install Aqua 【MAIN USE】The one way check valve prevents water from flowing back into the fish tank, reducing the water level and at tBE-TOOL BE-TOOL Check Valve Compressor Check Valve 3 Way Air Compressor Valve for Direct Air Compressor (Male, 3/8" x 14mm x 1/8 Made of brass for higher corrosion resistance than steelXHHTEC 12pcs Aquarium Air Pump Accessories,4mm Aquarium Pump Protectors Fish Tank Accessories for Air Pump Line,Air Control Val 【High-Quality Material】:Our check valve is constructed from durable, high-quality plastic, ensuring it is resistant to buxcell uxcell 2-Pack Brass Check Valve, 1/2" Female to 1/2" Male Thread One Way Non-Return Backflow Preventer Valve for Water T [Multipurpose Use] - Our one-way check valves are suitable for many environments and situations, be it water towers, watCWOQOCW CWOQOCW Adjustable Diffuser, Ventilation Pipe Round Check Valve Air Exhaust Valve Duct Control Exhaust Fan Pipe Accessor 【Excellent material】This ventilation pipe check valve is made from materials, ensuring exceptional durability and long-lLeytala Aquarium Check Valve, Non-Return Durable One Way Air Valve Plastic 10mm 2pcs for Gas for Liquid WantsGin 3PC 1/4 Female Threaded Air Check Valve, Nickel-Plated Copper Air Gas Water Non Return One Way Full Port Check Valve G 1/4 Female Full Ports One Way Air Check ValveWantsGin 3PC 1/4 Female Threaded Air Check Valve, Nickel-Plated Copper Air Gas Water Non Return One Way Full Port Check Valve G 1/4 Female Full Ports One Way Air Check Valvefasient 5pcs 1/4'' Female Threaded Hex Full Port One Way Air Check Valve Non-Return Valve ✔ Hex air check valve Made of high quality copper material, high strength, resistant to high temperature, sturdy and durANKROYU 5 - Pack 1/4in FPT Full Flow Brass Body Check Valves, Air Check Valves, Female Threaded Air Valves, Compressed Air Check [Durable Copper Construction]:The copper body and internal components provide maximum durability and strength, with corrMingzhe Brass Air Compressor Check Valve High Strength 90 Degree Male Thread Spare Parts 20 * 14 * 10mm [Great Replacement Part] Perfectly replaces old or faulty check valves in your air compressor, improving efficiency.BIGTEDDY 10mm Aluminum One-Way Non-Return Check Valve Fuel Water Gas/Air Vacuum AU - 100% Brand NewLT Easiyl LT Easiyl Pack of 5 Check Valve Hose Barb One Way Inline Check Valve Plastic Check Valve Non Return Check Valve for Fuel Versatile Functionality: Designed as a unidirectional check valve, this product effectively prevents reverse flow, maintLiyquint Standard Aquarium Air Pump Accessories Set 4m Airline Tubing Standard Tubing Air Stones Check Valves Suction Cups and Co 【Package Included】4 m Aquarium Airline Tubing, 2 pcs Aquarium Air Control Valves, 2 pcs Aquarium Air Stones, 2 pcs AquarKepfire Kepfire 5 Way Air Flow Outlet Control Valve Fish Tank Adjustable Oxygen Splitter Lever Blue Tube Pump Distributor 5 Chec Adjustable blue plastic 5 way oxygen distributor, outlet size:4mm/0.16", inlet size:4/8mm/0.16"/0.31", 11.7 x 5.2 cm(L xLiyquint Standard Aquarium Air Pump Accessories Set 4m Airline Tubing Standard Tubing Air Stones Check Valves Suction Cups and Co 【Package Included】4 m Aquarium Airline Tubing, 2 pcs Aquarium Air Control Valves, 2 pcs Aquarium Air Stones, 2 pcs AquarPenitue CAC-437-2 Air Compressor Check Valve, Premium Brass 1/2 NPT & 1/2 CFPC Fittings in Valve Replacement Practical Air Compr Package Includes: You will receive 1 pieces of the air compressor check valve, which effectively prevents backflow and eYDuupxe Inline Check Valve One Way Barb Hose Plastic with Pressure Non Return 8mm Used for Oil Water Air Gas 1. Inline Check Valve: Inline check valve allow the liquid or air to stream in one way, thus preventing backward streamuxcell uxcell 10-Pack Aquarium Air Check Valve, Plastic One Way Non-Return Valves Air Valve Air Tubing Accessories Air Pump Acc [Multipurpose Use] - Plastic one way non-return check valve suits most aquariums, fish tank scenes, and fishing tackle sNDNCZDHC NDNCZDHC Check Valve Opening Pressure Within 2KPA One‑Way Check Valve 300KPA Back Pressure PP Air Pump Check Valves (3/1 Pagoda-Shaped Slot: The check valve nozzle features a pagoda-shaped slot, ensuring non-slip, airtight performance with eAcrylic Standard Aquarium Air Pump Accessories Set,Aquarium Air Pump Accessories Kit with Standard Tubing, Air Stones, Check Val ☆ Package Included:4 Meter aquarium airline tubing, 2 cylindrical air stones, 6 suction cup clamps, 4 connectors(2 T-pasVigorighter 5/32" 2PCS Fuel One-way Check Valve, Aluminium Alloy 4mm OD Fuel Line Check Valve One Way Non Return for Diesel Gasoline 【Durable Construction】 Crafted from high-quality aluminum alloy with a 304 stainless steel spring and NBR rubber seals,SING F LTD SING F LTD 2pcs Rubber Non-Return Valve Replacement Rubber Check Valve Compatible with Lay-Z-spa Air Blower One Way Non Compatibility: Our replacement rubber non-return valve is designed to seamlessly compatible with Lay-Z-Spa, ensuring hasezqnirk 1PCS Pneumatic Pipe Fitting Copper Check Valve Control Valve Air Valve Pneumatic Accessories,Male and Female 1/4 BESPORTBLE BESPORTBLE Aquarium Air Pump Check Valves 20 Pack One Way Non-Return Valves for Fish Your Air Pump Fish tank air check valve:great one way check for aquarium and fish tank,fish tank check valveNaisfei Naisfei Aquarium Air Flow Valves, 8-Way Aquarium Air Flow Control Lever Valve Chromium Copper Distributor Fish Tank Spli ✔ Package included: One 8-way Aquarium Air Distribution Tubes Aquarium Air Distribution Tubes,Suitable hose: input termiYUMISU Aquarium Air Pump Accessories Kit with Standard Tubing, Air Stones, Check Valves, Suction Cups and Connection Tee(Clear, ►Package including:The air pump accessories set included 1pc 2m/80inch airline tubing, 2 air stone, 2 check valves, 2 I-12% Off ZYWUOY 2pcs Dome/Mushroom Gaskets Connector Gasket for Coleman Air Blower Check Valve Gaskets Repair Kit Compatible Model: Miami, Palm Springs, Hawaii, Helsinki, Honolulu, Milan, St. Moritz, Paris, Cancun, Cali, AirJet,TDR TDR 2pcs Vacuum Tubeless Air Valve for Max G30 Xiaomi M365 Pro Electric Scooter Segway Tire Valve for Electric Balance S High-Quality Material: Crafted from durable copper core and rubber, this vacuum tubeless air valve ensures long-lastingMEZOKUCEL Aquarium Air Pump Accessories - Contains Airline Tubing 5 Meters, 10 Air Stones,5 Check Valves,5 T Shape, 5 Aquarium Suc 【Reliable and Durable】Aquarium supplies made of fine material, The air stone is fired under high temperature, not easy tJQFOROVU Aquarium Air Pump Quietest Aquarium Air Bubbler, Adjustable Oxygen Pump 5W Silent Powerful Aerator Pump for 1-550L Fish 【Powerful Air Delivery】: The powerful electromagnetic motor produces excellent air pressure and delivers a large amountLoopunk 37 Pcs Aquarium Air Pump Accessories with 4M Standard Aquarium Air Hose,Connectors, Check Valves, Oxygen Stones,Air Ston 【Material】:Aquarium Air Pump Accessories are made of PVC material, non-toxic, non-polluting. You can clean your aquariumAQUANEAT AQUANEAT 2/5/8-Way Aquarium Gang Valves Manifolds Air Distributor Lever Control Valves Airline Tubing w/Suction Cups & C One-Way Valves: A straight single way for air to get through. Suitable for hydroponics, aquariums and aquaculture in fisAuto-plaza Auto-plaza 2 pcs 1/8 Inch BSPT Schrader Tank Valve 25mm Wheel Air Compressor 35 Bar 500 PSI Good quality, 100% brand new.YDuupxe YDuupxe Male Thread 90 Degree Brass Check Valve, Durable Air Compressor Valve, Easy Installation for Compressors and Tan [High Strength Brass] Made from brass material for durability and reliable performance in air compressors.Mingzhe Inline Check Valve Fuel Gas ONE Way Non Returning Liquid AIR Valve 12MM White Plastic Hose Suitable Water Oils Pump [Prevent Backward ] This inline check valve ensures liquid or air flows in , preventing reverse .uxcell uxcell 1-Pack Brass Check Valve, 1/2" Female to 1/2" Male Thread One Way Non-Return Backflow Preventer Valve for Water T [Multipurpose Use] - Our one-way check valves are suitable for many environments and situations, be it water towers, watBaxnore Baxnore Check Valve, PVDF Non Return Valve, Wear Resist Unidirectional Check Valve, One Way Check Valve, Water Stop Valv Material: Made from PVDF, this check valve is known for its strength and durability; It can handle demanding conditionsuxcell uxcell 2-Pack Brass Check Valve, 1/2" Male to 1/2" Female Thread One Way Non-Return Backflow Preventer Valve for Water T [Multipurpose Use] - Our one-way check valves are suitable for many environments and situations, be it water towers, watHismee Hismee Aquarium Air Pump Rechargeable Portable Fish Tank Air Pump USB Aerator Battery Aquarium Bubbler 2 Outlets with St USB Rechargeable and Last Work Up to 60hrs: This aerator built-in rechargeable battery provides up to 60 hrs working timYDuupxe YDuupxe Male Thread 90 Degree Brass, Compressor One Way Valve 26 Gal Compressor Check Valve Air Check Spare Parts 20 * 1 brass material, high strength and durabilityTEEMO TEEMO Aquarium Air Pump, Fish Tank Air Pump with Dual Outlet Adjustable Air Valve, Ultra Silent Oxygen Fish Tank Bubbler Ultra Quiet: Made of ABS thickening engineering plastics, super silent aquarium air pump. Soft rubber foot pads, furtherSAMIKIVA SAMIKIVA (30 Pack) Tire Stem Valve Caps, with O Rubber Ring, Universal Stem Covers for Cars, SUVs, Bike and Bicycle, Tru O RUBBER RING - All dust caps for wheels has rubber rings, no air leaking on long, tough drives.uxcell uxcell 3-Pack One Way Check Valve, 1/2" Plastic Ozone Resistance Barb Hose Non Return Inline Check Valve for Fuel/Oil/Wa [Multipurpose Use] - Our one-way air check valves are suitable for a wide range of environments and occasions, whether iANKROYU One-Way Non-Return Inline Check Valves for Fuel, Gas, Liquid and Air Applications(1/8", 3/16", 1/4", 5/16")(3/16") [Strong corrosion resistance]: Made of sturdy and durable material, it can withstand oil, fuel, acid, alkali and other cLrocaoai Plastic Motorized Damper PVC Check Valve Air Duct Volume Controller for Ventilation Pipe 220VAC 75mm Model Number:Plastic DamperA-premium A-Premium Left Secondary Air Injection Check Valve Compatible with Subaru Forester 2005-2013, Impreza 2006-2014, WRX STI [Vehicle Fitment]: Compatible with Subaru Forester 2005-2013 H4 2.5L (Engine Desg. EJ255), Impreza 2006 H4 2.5L (EngineHyfive Tyre Pressure Monitor Caps Indicators 4 Caps 36 PSI 3 Colour Gauge Air Valve Tyre Pressure Monitoring Caps Are The Simple Way To Check Your Tyres Pressure. Using A Simple Traffic Light Colour SysteALEGI ALEGI 25 Feet 3/16 Inch Standard Aquarium Silicone Airline Tubing with Air Stones, Check Valves, Suction Cups and Connec Standard 3/16" ID x 1/4" OD Flexible Silicone Airline Tubing is for aquarium/Fish Tank/HydroponicsCerlyiont 2 Pcs Check Valve 3/8in, 200kpa One Way Check Valve, 10mm Plastic 1 Way Water Non Return for Air Compressor Aquarium Pum [BUILT-IN FORCE LIMITER] Equipped with a force-limiting device, this micrometer delivers precise and repeatable readingsKIMPAJIEN 4W Fish Tank Air Pump, 6L/min Quiet Adjustable Oxgen Pump, Powerful Aquarium Air Pump Aquarium Bubbler with All Accessor 🐠【Upgrade Noise Reduction】-This fish aquarium air pump is made of thickened ABS casing, aquarium air pump noise is supeHINZIC HINZIC 6 Pack One Way Check Valves, 1/2" (12mm) Hose Barb Non Return Ozone Resistance Plastic Valve Pump for Fuel Oil Wa 【Size】Diameter: 1/2"barb, can fit 1/2" hose ID; Total length: 43mm/1.69 inch.Generic Air Brake Hose Check Valve - One-Way Check Valve Tube Bleeding - Power Tool Parts Accessories Fluid Bleeder Replacement Safe Material: With its robust aluminum exhaust pipe and high-grade safe rubber hose, this clutch brake valve provides dFIRSTINFO FIRSTINFO Hydraulic Brake Bleeder Check Valve with Hose and Clamp for Replacing Brake Fluid 💎Efficient Brake Bleeding--Use in bleeding and servicing of hydraulic brakes which allows you to replace old hydraulicJIH JIH Aquarium Air Pump Accessories Set -25 Feet Airline Tubing Black Standard, Air Stones,Check Valves, Suction Cups and 25ft. Black Airline Tubing : 3/16 Standard ID Flexible material. 4 Control ValvesLIYJTK Metal Straight Air Compressor Check Valve Replacement 21mmx16mmx10mm 327 [PRECISE SIZE] Manufactured with precise dimensions for a tight seal during air compressor repair.JIH JIH Aquarium Air Pump Accessories Set -25 Feet Airline Tubing Black Standard, Air Stones,Check Valves, Suction Cups and 25ft. Black Airline Tubing : 3/16 Standard ID Flexible material. 4 Control ValvesTnfeeon Tnfeeon Brass Check Valve Air Compressor Male Threaded Connector 3 Port 3/8 Inch for Piston Pumps [Multiple Connectors] Features three male thread connectors for versatile tube and compressor piston pump connections.15% Off Tbest Carbon Dioxide Diffuser, Fish Tank CO2 Mini Acrylic Transparent Atomizer Bubble Counter Air Pump Accessories Check Valve Enhanced Photosynthesis for Aquatic Plants: This CO2 diffuser is designed to significantly improve the exhalation effectRosvola Stainless Steel CO2 Check Valve, Aquarium CO2 Check Valve Carbon Dioxide Check Valve One‑Way Aquarium CO2 Line Tubing fo One‑way professional check valve, small and compact, about 4cm/1.6in long, durable.ALEGI ALEGI Aquarium Bio Sponge Filter Kit with Air Tubing, Suction Cups, Check Valves for 55 Gallon Breeding Fry Betta Shrimp Sponge filter provide both mechanical and biological filtrationPlyisty Condensate Check Valve 20mm/25mm Non-Return Valve for Air Conditioner Drain Hose, Anti-Backflow Odor & Insect Proof Trip APPLICABLE SCENARIO: Condense drain pipe check valve can be used for condensate water outlet pipes of central air conditPRO-EDGE INDUSTRIAL PNEUMATICS AND CONTROLS 1/2" NPT Top Inlet Unloader Pilot Check Valve All in One, Plus Throttle Control Cable for 6.5HP Gas air Compressors and 1/2" Female Top NPT Inlet X 1/2" Male NPT Outlet, Combination pilot valve, check valve, unloader valve all-in-one for 6.UQGVML Brake Bleeder-One Way Check Hose Valve, 2PCS Brake Bleeding Kit Including Corrosion-Resistant Hose Aluminum Pump Valve B 【Leak-Free Performance】The brake bleeder kit forms a tight seal with the caliper valve, ensuring no leaks. Its one-way b