... .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 material ... .Various plastic raw materials: PP,PE,PS,ABS,PVC,HDPE,EPDM,PPS,PPO,POM,nylon,PEEK,PEI,TPU ... oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); plastic check valve/plastic one-way valve/non-return valve