It is made from high quality plastic and butadiene rubber. All performance reached standard and passed safety certification. 1,Material: high quality 1Cr18Ni9Ti,butadiene acrylonitrile rubber,POM.2,Quality: Technical performance, such as torque, return flow restriction, leakage, vent valve and pressure relies. Reached U.S. and Japanese design standard and passed safety certification. 3,Price: ...