Perfect Fits: Fit A/C manifold gauges R-134A service ports quick coupler adapter, 1/4" SAE male flare. Adjustable Coupler: It can be compatible with all models due to its 6 ball bearing design which can meet all demands you need. Premium Quality: This set is made of aluminum, copper and bronze. The switch of high-side and low-side are made of aluminum, the adapter is made of copper , and the body is made of electroplated bronze body. Which is durable and long lasting use, easy maintenance. Usage: Please connect bottoms with vehicle's R134A service port; connect the ACME adapter with the refrigerant hose; turn on/off the switch at top to turn it on/off This set of R134A air conditioning (A/C) quick couplers allow you to connect multiple hoses in the automotive industry / car R134A air conditioning system during diagnosis, charging, or evacuation. High and low connectors are included. Its safe design can effectively prevent injury and loss of coolant. Specification: Connector: 90 Material: Metal Compatibility: R134 Low Side Quick Coupler: Blue High Side Quick Coupler: Red Application: Car Add Fluorine Manifold Hose Connections on Both Adapters: 1/4" Size(L*W*H): Approx. 50 x 30 x 65mm / 1.97 * 1.18 * 2.56inch Inner Diameter(Blue): Approx. 14mm / 0.55inch Inner Diameter(Red): Approx. 16mm / 0.63inch Package Weight: Approx. 178g~187g