WIKA 4277784 Commercial Pressure Gauge, Dry-Filled, Copper Alloy Wetted Parts, 4-1/2" Dial, 0-100 psi Range, +/- 1% Accuracy, 1/4" Male NPT Connection, Bottom Mount Copper alloy wetted parts for high corrosion resistance against salty liquids Circular dial is four and one-half inches in diameter and is enclosed in a stainless steel case that resists corrosion Pressure ranges from 15 psi to 600 psi Display accuracy is + or -1 percent of span over the entire range of the gauge (ASME 40.100 Grade 1A) Lower back mount male connection with 1/4" NPT rate