Gauge Guard Connection Size 1/4 in Connection Type FNPT Diaphragm Material Buna-N 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