Gauge Guard, Connection Size 1/4 in, Connection Type FNPT, Diaphragm Material Viton, Maximum Pressure 250 psi, O-Ring Material Buna-N, Body Material Polypropylene, Connector Material Glass-Filled Polypropylene, Ambient Operating Temperature Range 0 Degrees to 185 Degrees F, Series GGME, Compatible Brand and Series Universal, Gauge Port Size 1/2 in NPT, Accuracy +/-4 Percent, Application Marine Applications, Spas, Swimming Pools, Water Conservation, Water Softening, Mounting Inline