Patent ID: 7527302

Claim:
A pipe fitting for connecting between a metal piece of plumbing and a polymer piece of plumbing, the pipe fitting comprising: a metal body having a tubular first end defining a first opening and an opposite tubular second end defining a second opening spaced from the first opening, the metal body in part defining a passage extending through the pipe fitting from the first opening to the second opening, wherein the second opening is part of a receptacle for internally receiving a metal piece of plumbing, and the receptacle includes at least one internal spiral thread for connecting the pipe fitting to the metal piece of plumbing by twisting; a tubular one-piece polymeric body molded within the first end of the metal body, the polymeric body having a radially outer surface molded against a radially inner surface of the metal body and having a radially inner surface that in part defines the passage and that is for mating with a polymer piece of plumbing; wherein the metal body defines an aperture extending from the radially inner surface of the metal body to a radially outer surface thereof, through which polymer material is injected for molding the polymeric body within the metal body, and wherein a portion of the polymeric body extends into the aperture; and the polymeric body has a shorter length than the metal body such that the metal body has an end part that extends beyond the polymeric body and defines a metallic inner surface and a metallic outer surface that are both exposed, said metallic inner surface surrounding the second opening and defining the receptacle and the at least one internal spiral thread for being mated to a metal piece of plumbing.