Best Dual Check Valves

PVC True Union Check Valve 1’’ Slip Swing Full Port Utility Check Valve Sch80 Socket Pool Ball Check Valve for Backflow Prevention

【PVC Ball Check Valve】Schedule 80 PVC ball check valves have a spherical ball inside the valve body which works as a check to allow flow in one direction and close off to prevent back-flow..
【INSTALLATION TIP】PVC union check valves are designed for VERTICAL installations, MUST be used in an upflow position to work properly. Check valves MUST be installed with the valve's flow arrow pointing in the direction of the flow. Do not install valve upside down.（NOTE: NO SPRING).
【PVC Union Check Valve】True union check valve, can be taken apart for cleaning, allows for easy removal without breaking down the piping connection..
【Material】1'' Slip check valve made of PVC material, O-ring with EPDM material, low-temperature-resistant, impact-resistance, ultraviolet-resistance, rust-resistance. Fits for Schedule 80 1 Inch Pipe..
【Application】PVC Swing Check Valve 1’’(DN25) - Non-return or "one way" valve is ideal for flow control, such as commercial plumbing, aquariums, irrigation, swimming pools, water parks and OEM applications..

Ultra Silent: Dual housing structure for sound insulation.
4 rubber feet attached to the bottom to minimize vibration..
capable of producing sufficient air to run multiple air stones, sponge filters, bubble bars, air discs, an under gravel system or hydroponic growing system..
Adjustable Air Flow: An easy-to-access control knob on the cord..
Dimension: 6 x 5.5 x 4 inches (L x W x H).
the quietness and the power make it a perfect choice for large tanks, multiple aquariums, and living room fish tank.（Note: This air pump is much more powerful than regular air pumps, and some ordinary check valves can’t stand the air flow and make whistling sound. In this case, you can remove the check valve and place the air pump higher than the water level.).
Package includes: 1 x Air Pump, 2 x 2-outlet Gang Valves (easy to individually adjust air flow to different tanks.).

Pre-assembled piping and check valves included.
1-1/2 inch FNPT discharges, piggyback float switches.
Clog-resistant design (1/2" semi-solids handling), PSC motors, not suitable for pond use.

Replacement for General Pump Check Valves Kit - Kit 1, Valves and O-Rings (K01).
Complete Valve Kit Includes Six O-rings and Six Check Valves Complete.
High Quality Material for Best Performance.

Body Material:Stainless Steel 316,200PSI/PN16,ANSI B1.20.1.
Working Pressure 200 WOG,Port Types:Female x Female threaded.
Temperature range: -60 to 450 degree Fahrenheit,Suitable for full range of liquids and gas.
Check valves are used to help direct flow in one direction. The stainless steel bodies and PTFE seals are highly corrosion resistant allowing these check valves to be used with a wide variety of fluids including, but not limited to water, oil, gas, air, light alkali's, acids, biodiesel, fuels and alcohols..
Swing check valves are for horizontal use only. When fluid pushes on the stopper in the correct direction, it will "swing" open to allow flow. If flow moves in the opposite direction, it will swing shut. The check valve cannot be used in vertical applications as gravity may affect the function of the swinging motion..

Package Includes：14feet clear tubing,2pcs 1" air stones,2pcs check valves,2pcs clear T connectors,6pcs clear suction cups.
Airline tubing: standard 3/16" diameter common to most airline accessories.
Air stones: durable and can produce fine bubbles continuously to diffuse oxygen efficiently in your fish tank.
Check valves: place these air pump check valves in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
Suction cups and T connectors: fit 3/16 inch ID standard airline tubing.

Specially designed non-return valves will protect your air pump by preventing aquarium water from back siphoning during a power outage.
They are made of plastic material for long time use.
Place these air pump check valves in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
Fits standard aquarium airline tubing with inner diameter about 4mm.

Dual inlet thread for connecting pipe and locknut.
Machined flange for support against tank wall.
Dual inlet thread for connecting pipe and locknut, high tensile serrated arms, locknut included with male inlet valves.

Specially designed non-return valves will protect your air pump by preventing aquarium water from back siphoning during a power outage.
They are made of plastic material for long time use.
Place these air pump check valves in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
Fits standard aquarium airline tubing with inner diameter about 4mm.