ITEM NAME:1Pair R134A AC Air Coupler Adjustable Quick High Low Adapter Connector.1 Pair R134A AC Air Condition Adjustable Quick Coupler High Low Adapter Connector. This set of R134A air condition (A/C) quick couplers allow you to attach the manifold hoses onto. the automotive/car air condition R134a system during the diagnosis, charging, or evacuation.