The Hose Bibb Pressure Gauge is utilized to measure water system pressure within a building. It features a maximum pressure indicator with a 3/4” hose adaptor for direct connection to any hose bibb thread or water heater drain valve for homeowner applications. The HGI-25 monitors the highest pressure reached and registers maximum system pressure caused by thermal expansion or pressure spikes. Its indicator needle may be reset by turning the external knob in a counter-clockwise direction, and it is for use on water service only. Other features include a 0 psi to 200 psi range with 2 psi graduation, and a convenient pegboard packaging.