Abstract: A plumbing fixture that includes a threaded connection, including a male part having external threads and a female part having internal threads associated with one or more protrusions interspaced such that when the female and male parts mate together, the protrusions on the male part deformably interfere with the protrusion on the threads of the female part to resist loosening of the threaded connection.

Abstract: A self-locking threaded connection including an externally threaded male part having a hollow center and a series of cooperating members; and an internally threaded female part having a series of cooperating members; the cooperating members consisting of projections and detents. As the parts are threaded together, the reception of the projections into the detents produces both audio and tactile responses indicating that the connection is made and near a destructive over tightening.

Abstract: The present invention is a plumbing fixture that includes a threaded connection, including a male part having external threads and a female part having internal threads associated with one or more protrusions interspaced such that when the female and male parts mate together, the protrusions on the male part deformably interfere with the protrusion to resist loosening of the threaded connection.