Gauge Accuracy: +/-3-2-3%. Gauge Type: Dry. Application: Replacement Manifold Gauge for Manifold Gauge Sets. Diameter: 2-1/2". Color: Red. Working Pressure: 0 to 800 psi. For Use With: R-22, R-404A, R-410A. Item: Replacement High Side Pressure Gauge. Connection Size: 1/8" (M)NPT.