Good ozone resistance, high temperature resistance, and corrosion resistance. With sufficient pressure capacity and rigidity to meet actual usage requirements within its appropriate range. Widely used in water treatment, air purification, auto parts, machinery industry, medical equipment, household appliances, etc. This one-way check valve makes it easy to replace broken check valves. This one-way check valve makes it easy to replace broken check valves. plastic check valve way aquarium air pump check valves red airline tubing suction cups Plastic one-way valve Specifications: Item Type: Check Valve Material: Food Grade PP (Polypropylene) Inner Diameter: 3.8mm/4.9mm Temperature: 0~120C The Thinnest Outer Diameter: 5.0mm/6.0mm (Optional) Color: Translucent Package List: 5 x Check Valve