... joint, single-sphere, double-sphere, twin sphere union 1) Butt-welded fittings, flanges, rubber joint, single-sphere ... 2) Cast iron and ductile iron butterfly valves, gate valves, globe valves, check valves, Y-strainers ... ) Stainless steel valves, ball valves, flange connecters, gate valves, stop valves, butterfly valves, check valves and ... stainless steel pipes and fittings from 1/4" to 4": Bend Pipe 1