Plast-O-Matic Valves” Series GGME all-thermoplastic, compact gauge guard is designed for corrosive liquids. The gauge guard is a 1 3/8″ high seal that isolates gauges and other instruments from a chemical process. The barrier seal transmits pressure with an accuracy of +/- 4 percent. The design is based on an ultrasonically welded, unibody construction with a natural polypropylene connection on the process side. The guard prevents dangerous leaks and precludes rupture of the diaphragm seal even if the gauge is accidentally removed. Polypropylene provides excellent chemical compatibility and is suitable for process temperatures to 185 F.