ARKSEN A/C Manifold Gauge 3 Hoses High/Low with Air Vacuum Pump A/C Tester Refrigerant Gas Service Aluminum alloy manifold testing body with built in sight glass 4 Valve dual manifold gauge w/ hose set Designed to meet 1/4" Standard SAE requirement for refrigerant permutation Venturi-Type AC Pump Eliminates Moisture from Air Conditioning System, Makes It Safe and Easy To Charge Refrigerant Vacuum Port: 1/2" ACME (R134a) & R12 Connector