Auto Hvac Adjustable Quick Coupler Adapters & Refrigerant Can Tap

Also there are rubber seal rings inside, ensure the gas tightness and no leak. The internal pin is connected with the upper knob to realize the adjustable function. While using, CCW switch the knob to close the R134a coupler, fasten it to the AC service port, then CW switch the knob to lift the internal pin to insert and push back the Schrader valve core slowly.