Abstract: A union fitting replacement nut having a nut body and a peripheral strap. The nut body is formed from a pair of C-shaped members. The nut body is internally threaded to cooperate with the external threads of the union fitting to which the union replacement nut is to be installed. The peripheral strap is typically a steel strap having opposed first and second ends. Attachment means, such as an adjustment screw, is provided to incrementally adjust the tightness of the peripheral strap to rigidly retain the two C-shaped members of the nut body. Once assembled, the union replacement nut can be used in the same way as a prior art integral union nut.

Abstract: A fitting suitable for coupling a plastic pipe to an externally threaded metal element, such as a sprinkler head, comprises a coupling, an external, metallic reinforcing collar on the coupling, an internally threaded insert in the coupling, and an O-ring. The collar is shaped to prevent rotation, and is held in place by a lip on the insert. The O-ring is held in a chamfered recess on the external surface of the insert.