Ashcroft® 1131 Series Differential Pressure Gauges are utilized for applications where migration of the process media is not permissible. They use a rolling diaphragm design to separate the high and low pressure ports to isolate the media and can see up to 3000psi static pressures. Body materials for the 1131 series are available in Aluminum, Brass, and Stainless Steel, with Buna, Viton, or EPDM seals. Dial sizes range from 2.5" to 6" and the case can be dry or liquid (glycerin) filled. The 1131 series is most commonly used for filtration monitoring, flow measurement, leak detection, and condition monitoring across heat exchange.