| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure stable connection strength by visually performing confirmation of a connection interface condition between a joint and a resin pipe. SOLUTION: A device has a joint main unit 4 composed of thermoplastic resin of pipe shape having light permeability, colored thermoplastic resin layer 6 integrally formed in a position into contact with a connected unit 2 inside the joint main unit 4, electric heater wire 5 provided in the inside and an external surface or internal surface of the colored thermoplastic resin layer 6 and a fine hole 7 leading to in the vicinity of a boundary with the colored thermoplastic resin layer 6 from an external surface of the joint main unit 4. At completion time of fusing, a colored fusing body is expansibly discharged from the fine hole 7.</p> |
