... .20,25,32,40,50mm plastic check valve/one-way valve/non-return valve 2.material:PPO 3.HDT:120c ... 20,25,32,40,50mm plastic check valve/one-way valve/non-return valve with germany standard,PPO material,heat ... We also can make any non-standard plastic check valve as per your drawing and requirement. The ... low price,prompt delivery. If you have any interest in our products,please feel free to contact us. ...