Guardian WRT 20 HD Telephone, WRT 20 HD, Volume Control, Outdoor, 1 Lines, Wall, Plastic, NEMA 3R 49R130 Item Fire Sprinkler System Pressure Item Fire Sprinkler System Pressure Gauge Connection Location Lower Gauge Application Fire Sprinkler Systems Range 0 to 80 psi Accuracy + 3 2 3% Material ABS Color Black Gauge Primary Range Values 0 to 80 Gauge Primary Range Units psi Gauge Connection Type MNPT Basic Gauge Case Material Plastic Case Color Black Gauge Primary Range Numbered Graduations 20 Gauge Case Material ABS Plastic Gauge Sensor Material Phosphor Bronze Liquid Filled No Basic Gauge Lens Material Plastic Calibration Certificate Included No Basic Gauge Sensor Material Bronze Gauge Lens Material Polycarbonate Gauge Socket Material Brass Gauge Accuracy + 3 2 3% Series 1005P Pressure and Vacuum Gauge Type Pressure Gauge Basic Gauge Socket Material Brass Operating Temp Range (F) 40 to 275 Metal Detectable Yes Maximum Operating Temperature 275 Degrees F For Number of Lines 1 Cushion Material Santoprene Clamp Material 316 Stainless Steel Clamp Type Stacking Clamp Assembly Minimum Operating Temperature 40 Degrees F Clamp Bore Style Smooth Load Capacity 75 lb Includes Mounting Hardware Yes Bolt Material Stainless Steel Top Plate Material Stainless Steel Series Smooth Bore Number of Mounting Holes 0 For Use On Pipe Volume Control Yes Overall Height 12 in