Features Backflow Prevention: Good thermal performance, strong chemical stability, the aquarium check valve can prevent gas or liquid backflow. Strong Pressure Bearing Capacity: One way valve has enough pressure bearing capacity and rigidity to meet the actual use requirements within its proper range. Corrosion Resistance: The non return valves kit has good ozone resistance, high temperature resistance and corrosion resistance, used in fish tank, food and beverage, chemical industry. Perfect Replacement: This air valve PP check valve is easy to replace the broken check valve, perfect replacement, stable performance. PP Material: One way check valve is made of high quality PP material, which is wear resistant and durable, and can be used for a long time. Specification: Item Type: Aquarium Check Valve Material: PP Function: Connect the Hose to Prevent the Backflow of Gas or Liquid Scope of Application: Fish Tank, Food and Beverage, Iatric Equipment, Chemical Industry Package List: 12 x Aquarium Check Valve Package List 12 x Aquarium Check Valve