The M-4752 is a 0-600 PSI liquid filled pressure gauge that has a front O.D. of 2 3/4", glass face diameter of 2 3/8", back steel case fits a hole size of 2 1/2" O.D.. This gauge is a center back mount with 1/4" NPT threaded connection. Panel mounting hardwaret is included for attaching to a panel. Can be used with our M-151-B gauge bracket panel. (Image shown is a 0-500 PSI Liquid Filled Pressure Gauge.)