ball check valve,double union check valve 1.Size:1/2",3/4",1",1-1/4", ... .Standard:ANSI,JIS,DIN,BS OR BSPT,NPT ball check valve,double union check valve 1.Description1).Name: pvc union2).size: 1/2", 3 ... OR NPT,BSPT5).Working condition:1.0Mpa6).end connector: socket7).pressure:PN108).Application: water supply,water draining,farming,irrigation,aquiculture,and ...