McMaster 4004K63 Dual Scale Pressure and Vacuum Gauge with Steel Case, 2 1 2" Dial Diameter, 1 4 NPT Bottom Connection, 0–100 psi 4AAA3 600 lbf Includes Adapter Kit 600 lbf Includes Adapter Kit for Slope Descent with Manual Breaking Trolley Standards ANSI Z359 Line Material Steel Color Blue Rescue Mode Lower Brand and Series 3M DBI SALA Rollgliss Series Rollgliss Workers per System 1 Harness End Connection Snap Hook Operation Mode Manual Includes Rescue Pole No Descent Type Sloped Kit Includes Suspension Bars 1 in Product Type Dial Drop Vacuum For Use With Air Display Type Dial Dial Type Dry Dial Diameter 2 1 2" Pipe Size 1 4 Scale Type Dual Scale psi Also known as compound gauges