Electrofusion joint and hot water supply header using the same

An electrofusion joint comprising

• a main body portion comprised of a crosslinked thermoplastic resin, said main body portion having an interior surface and an exterior surface;
• at least one joining portion comprising a non-crosslinkable thermoplastic resin embedded in the interior surface of said main body portion without extending t the extreme end of the electrofusion joint, said joining portion having an electrical heating wire associated in contact therewith so that the joining portion may be heat-welded to a pipe brought into contact with said joining portion;
• and
• a supporting portion molded as one piece member with said joining portion and comprising the non-crosslinkable thermoplastic resin, a groove into which the pipe is to be inserted being defined between the supporting portion and the interior surface of said main body portion wherein the joining portion is embedded.

An electrofusion joint comprising

• a main body portion comprising a crosslinked thermoplastic resin having a tubular configuration at one end, said main body portion having an interior surface and an exterior surface;
• at least one joining portion comprising a non-crosslinkable thermoplastic resin embedded in the interior surface of said main body portion at an end opposite to the end having a tubular configuration without extending to the extreme end of the electrofusion joint, said joining portion having an electrical heating wire associated in contact therewith so that the joining portion may be heat-welded to a pipe brought into contact with said joining portion;
• a supporting portion, a groove into which a pipe is to be inserted being defined between the supporting portion and the interior surface of said main body portion wherein the joining portion is embedded;
• and
• a connecting member fitted into and fixedly secured to said tubular end of the main body portion on its interior by an intervening layer comprising a modified thermoplastic resin, said connecting member being provided with a mechanically connecting means, said connecting portion being molded as one piece member with said supporting portion.