THIS IS NOT A SCHRADER VALVE! The piercing needle acts as a stop to prevent refrigerant from escaping from the open port. The end of the hose that goes to the refrigerant bottle fits perfectly into a small can of R134a from an auto repair shop. I used several YouTube videos to help me install. Installation was quick and easy. My only complaint is that I had to trim the gasket a bit to fit the clamp. I used this to fix my dehumidifier that was no longer producing water and was low on refrigerant. Works great now!
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