... 2.describe:union ball valve 3.type:single,double,thread,butterfly,brass ball 4.material: ppr, ... can provide various of single/double Union valves, check valves, membrane valves, bottom valves, gate valves, locking valves, deflation ... , chemical, pressure, traditional, easy clean, single , double, vertial, horizontal, perfect, small, big, thinkness, inch, structure, surface, tempreture, MAX, MIN ...