1.20,25,32,40,50mm plastic check valve/one-way valve/non-return valve 2.material:PPO 3.HDT:120c 4.Germany standard Our ... 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.We also can make any non-standard plastic check valve as per your drawing and requirement. The following is brife ...