ARKSEN Aluminum AC Manifold Gauge Set R134a A/C HVAC Burst Pressure: 3000 PSI / Max Working Pressure 500 PSI Blue Valve (Low): 2-1/2" Diameter, 0-120 PSI With 0-30 VAC Red Valve (High): 2-1/2" Diameter, 0-500 PSI Yellow 60" Long Charging Hose (1/4" ACME x 60" with knurled fittings) Gauge Reading: R134a