dual range scale dry pressure gauge bottom brass connection diameter:1.5",2",2.5",3",4",6". Black Steel Case Dual Scale Dry Pressure Gauge 1. Diameter: 1 ½", 2", 2 ½ ",3",4",6";2.Case: black steel case;3.Window:glass, acrylic, polycarbonate;4.Internal: brass, stainless steel;5.Inlet thread:1/8", 1/4", 3/8",1/2",NPT,BSPT,BSP;6.Connection: bottom connection, center back male connection;7.Range:0~10 ...