The Matco Tools' UC10 Universal Quick Coupler safety lock reduces the risk of possible injury or damage due to accidental air line disconnect. The UC10 can be used with most US and European couplers. A built-in air flow regulator opens up to 85 cfm of air. Once engaged, turning the regulator ring locks and regulates the air flow. The UC10 includes a pressure release which eases connecting and disconnecting air tools. No whiplash when disconnecting tools.