Abstract: A pipe fitting comprises a body and a collet slidably disposed completely within the body. Disposing the collet completely within the body mitigates the likelihood of the collet being inadvertently pushed in so as to loosen or disconnect a pipe from the pipe fitting. Optionally, a tool could be used to push the collet in so as to release the pipe from the pipe fitting. A locking clip having a break-off locking tab may alternatively be used to prevent inadvertent loosening of the tubing from the fitting. Markings or color coding could be used to insure that a correct length of tubing is inserted into a fitting. Tubing could be tapered or an expander could be used to mitigate the likelihood of damage to the fittings o-ring during insertion of tubing.