316 Stainless Steel 168.3 x 114.3 butt weld pipe reducer (6 inch x 4 inch NPS)
Stainless steel pipe reducer, likely a concentric reducer. This fitting reduces a6″ pipe (168.3 mm) to a4″ pipe (114.3 mm). Material: 316/316L Stainless Steel. Thickness: 2mm.