Dial size: 1.5", 2.0", 2.5", 3.0", 4.0" Case type: black steel case, chrome plate bezel Dial ... size: 1.5”, 2.0”, 2.5”, 3.0”, 4.0”Case type: black steel case, chrome plate bezelWindow: glass ... : brassBourdon tube: brass or phosphor bronzeConnection: brassThread:1/8”, 1/4”, 3/8”, 1/2”NPT,BSP,BSPT or according to ... have no effect on bronze and brass Exact air pressure gauge