... Only produce mould 2.describe:union ball valve 3.type:single,double,thread,butterfly,brass ball 4.material: ppr, pvc ... clear communications.2. We can provide various of single/double Union valves, check valves, membrane valves, bottom valves ... fast, long, excellent, chemical, pressure, traditional, easy clean, single , double, vertial, horizontal, perfect, small, big, thinkness, inch, structure, surface ...