The Jones Stephens 5 lbs. Gas Test Gauge Assembly regulates air to an even flow. It has a large 4 in. face. The maximum pressure reading of the gauge is 5 PSI. 4 in. face Includes pressure snubber Regulates air to an even flow Class 1A gauge 5 PSI maximum pressure reading Protects the diaphragm from compressed air damage Individually boxed Tackle down all your tube and pipe bending works with great ease by choosing this highly durable JONES STEPHENS Class Gas Test Gauge Assembly with Face and Pressure Snubber.