2.5" Face Liquid Filled 0 - 300 PSI Center Back Mount Pressure Gauge SEC-202L-254HLiquid filled air pressure gauge. This gauge has a glycerine filling that helps dampen the effects of pulsation and vibration, while also perpetually lubricating the movement, and keeping contaminates such as dirt away from all moving parts, which will extend the life of the gauge. This gauge reads at 0, 50, 100, 150, 200, 250, and 300 psi. Bar reading at 0, 5, 10, 15, 20 Specifications: Dial size: 2. 5" Connection size: 1 4" male NPT which measures