Plastic air flow non return plastic one way valve

Non-Return (Check) Valves - Fiedler

BornFeel Plastic One Way Non-Return Check Valves 16pcs Aquarium Air Pump Accessories for Fish Tank Air Line Tube Tubing Hose Pipe Fitting Clear Brand: BornFeel. ... The three-way valve is metal and splits the air flow to the under gravel filter and an air stone. Increase or decrease the air flow to each with the handles that are easily adjusted.