E-outstanding 26ft 3/16 Standard Aquarium Clear Flexible Silicone Airline Tubing with 5PCS Non-Return Check Valve for Fish Tank Air Pump

The check valve is made of high-quality materials and silica gel and has a long service life. The air tube is made of silicone, non-toxic, white, soft, resistant to bending, safe for fish, and suitable for fresh water or sea water. You can place the red check valve in the air pipe between the air pump and the water in the aquarium to prevent the water from siphoning from the back. The check valve is suitable for the air connection of the fish tank pipe with the inner diameter of 4mm and the aquarium pump to prevent the water backflow from damaging the pump when the power is cut off. Suitable for aquariums, fish tanks, hydroponics, etc.