Boiler Gauge Case Round Dial Size 2 1/2 In Connection Location Back Connection Size 1/4 In NPT Pressure Range 0 to 75 PSI Pressure Accuracy +/-3-2-3 Temp Range 60 to 260 F Temp Accuracy +/-3 Case Material Steel Case Color Black Socket Material Brass Tube Material Bronze Window Polycarbonate Stem Length 1.59 In Stem Extension 0.9 In