... factory has 20,25,32,40,50mm plastic check valve/one-way valve/non-return valve with germany standard,PPO material,heat deflection temperature:120c ... ,PPO,POM,nylon,PEEK,PEI,TPU,LCP etc.Mould material: high-quality alloy steel with heat treatment,wear resistance,corrosion resistance ... I make sure you will be satisfactory with our service,high quality,low price,prompt delivery. If you have any interest ...