| 摘要 |
PROBLEM TO BE SOLVED: To provide a coupler for a pipe that prevents damage of a casing caused by biting of the end part of a grip ring provided between the inner wall of the casing and a sleeve into the inner wall of the casing.SOLUTION: In a coupler 100 using a casing 110 comprising a synthetic resin, an invasion prevention ring 1 is provided between a grip ring 130 and the inner wall of the casing so that the outer peripheral end part of the grip ring 130 can be prevented from biting into the inner wall of the casing and damaging the casing. |
