Safe Material --- Good quality material, safe and reliable, high mechanical strength, adsorption properties and thermal stability, plastic inline check valve can be used to deal with most kinds of liquid. Product Information --- Hose size is 12mm/1/2", opening pressure: >0.015MPA, water non return valves excellent for water pipe fitting. Convenient And Practical --- one way non return check valve arrow marked on valve, showing fluid flo-w direction, prevents fuel from returning back to the tank and keeps it in the line. Function --- These 1/2 Inch check valves are applicable for fluid systems to stop countercurrent liquids, or for pneumatic systems to prevent reverse flo-w of compressed air. Multiple Application --- Mechanical valve is widely used in water treatment, air purification, automotive parts, machinery industry, household appliances and other fields., Weight: 0.0220462262 pounds, Manufacturer: Jenngaoo