upvc single union ball check valve 1)size 1/2",3/4",1",1-1/4",1-1/2",2" 2)quarter-turn shut ... water treatement and other fields3)Size 1/2",3/4",1",1-1/4",1-1/2",2"(Standard: DIN,JIS,ANSI ... Warranty long service life8)end connector:socket or threaded 2.Adavantage 1) oven test no sign of bubble or cracks ... strength 3.Specification size1/2"3/4"1"1-1/4"1-1/2"2"socket bottom diameter21.2326.5733.2742.0448. ...