Abstract: A medical gas adapter useable for connecting a gas tubing or other end use device to a gas service outlet to supply the gas for its end use. The adapter has a fixed adapter assembly including an elongated nose that fits within the gas service outlet to activate a valve for releasing gas to the adapter. The fixed adapter assembly also includes a connector means at its other end for connection to the end use device. A release knob is rotatably affixed to the fixed adapter assembly and can be rotated between a first position where a locking mechanism retains the adapter held within the service outlet and a second position where the adapter is released from the service outlet. The release knob is spring biased to return to its first position in the preferred embodiment by a pair of molded leaf springs integrally molded with the release knob for inexpensive manufacture and assembly.