... use, black steel case, plastic rotating window, brass internal and connection. Product Name:stainless steel & glass dial face ... , 2.5, 3, 3.5, 4,62) Connection size: 1/8, 1/4, 1/2, 3/83 ... ) Connection threads: npt, bsp (g, pf), bspt (zg, ... , chrome plated steel, stainless steel,iron5) Material of connection and internal: brass, chrome plated brass, stainless steel6) Scale: single ...