... window, brass internal and connection. Product Name:iron case with chrome plated Pressure Gauge 1) Dial size: 1.5, 2, 2 ... ), bspt (zg, pt)4) Case material: black steel, plastic, chrome plated steel, stainless steel,iron5) Material of connection and internal: brass ... 3% , ±2.5%8)Lip Material: Plastic, plastic dial face, glass dial face9)Bourdon Tube: brass, phosphor bronze, stainless steelInner Packing ...