... communications.2. We can provide various of single/double Union valves, check valves, membrane valves, bottom ... elbow, coupling, tee, reduce, cap, union, flange, flexible connector, water supply and sewerage pipe fitting moulds, etc. made ... , long, excellent, chemical, pressure, traditional, easy clean, single , double, vertial, horizontal, perfect, small, big, thinkness, inch, structure, surface ...