XtremepowerUS AC Manifold Gauge Hose Quick Coupler Air Conditioner Freon Blue gauge (low): 2-1/2" diameter, 0-120 PSI with 0-40 VAC Red gauge (high): 2-1/2" diameter, 0-500 PSI Burst pressure: 3000PSI;Max working pressure 600PSI Includes 3 color-coded 5 FT R134a hose. Work with r134a can. Ideal for R134, R134A, R12, R22, R22A, R404A, R407C R502