... .20,25,32,40,50mm plastic check valve/one-way valve/non-return valve 2.material:PPO 3. ... has 20,25,32,40,50mm plastic check valve/one-way valve/non-return valve with germany standard,PPO ... also can make any non-standard plastic check valve as per your drawing and requirement. The following is ... .init( { 'aImgSrc': aBigImageSrc } ); } )(); plastic check valve/plastic one-way valve/non-return valve