Replacement Low Side Pressure Gauge Diameter 2 1/2 in Working Pressure 30 in Hg to 120 psi Connection Size 1/8 in (M)NPT Color Blue Gauge Type Non Liquid Filled Gauge Accuracy +/-3.00 Percent For Use With R-12 R-22 R-502 Application Replacement Manifold Gauge for Manifold Gauge Sets