... , single-sphere, double-sphere, twin sphere union 1) Butt-welded fittings, flanges, rubber joint, single-sphere, double-sphere, twin sphere union ... valves, gate valves, globe valves, check valves, Y-strainers 3) Ductile iron fittings, cam locks (aluminum, brass and stainless steel) 4) Stainless ... Y-strainers 5) Various kinds of stainless steel pipes and fittings from 1/4" to 4": Bend Pipe 1