1.20,25,32,40,50mm plastic check valve/one-way valve/non-return valve 2.material:PPO 3.HDT:120c 4.Germany standard ... factory has 20,25,32,40,50mm plastic check valve/one-way valve/non-return valve with germany standard,PPO material,heat deflection ... ,PEI,TPU,LCP etc.Mould material: high-quality alloy steel with heat treatment,wear resistance,corrosion resistance.Advanced equipments:precision ...