... Gauge For general use, black steel case, plastic rotating window, brass internal and connection. Product Name:iron case with chrome plated Pressure Gauge 1) ... threads: npt, bsp (g, pf), bspt (zg, pt)4) Case material: black steel, plastic, chrome plated steel, stainless steel,iron5 ... brass, chrome plated brass, stainless steel6) Scale: single or double with psi (lb/in), bar, kg/cm2 (kgf/cm2 Kpa, ...