... For general use, black steel case, plastic rotating window, brass internal and connection. Product Name:iron case with chrome plated Pressure Gauge 1) ... Connection threads: npt, bsp (g, pf), bspt (zg, pt)4) Case material: black steel, plastic, chrome plated steel, stainless steel,iron5 ... special printing acceptedOuter Packing:Cartons, packed in PVC belt iron case with chrome plated Pressure Gauge