This hose connection gauge is used to test water supply pressures within a distribution system. Its red indicator hand holds at the highest reading registered for detection of thermal expansion pressure surges. The high accuracy of this gauge makes it an excellent choice for both contractors and homeowners. Easy to install Red indicator hand marks the highest system pressure Highly accurate Durable Series Name: Water Pressure Test Gauge Type: Pressure relief valve Inlet Diameter: 3/4-in Inlet Size in Inches: 3/4-in Outlet Diameter: 0 Inlet Thread Type: MGHT Material: Brass Maximum Pressure: 200 PSI Outlet Thread Type: N/A Compatible Pipe Material: Multi-Purpose Warranty: 1-year CA Residents: Prop 65 Warning(s): Yes Complies with Federal Lead Guidelines: Yes UNSPSC: 40141600