Get a discount on the Jones Stephens J66300 300 Psi Water Test Gauge here at our online store, PlumbersStock.com. This 300 PSI water test gauge has a steel case with a 2-1/2 inch shatterproof face and a plated body with a 3/4 inch brass hose connection. Jones Stephens is a trusted name for good reason. They have earned their reputation with quality manufacturing.