Patent ID: 7527303

Claim:
A connector with check function for connecting pipes for fluid, one of the pipes comprising an annular protruding portion on an outer periphery thereof at an end portion, the connector comprising: an approximately cylindrical housing coupled to another of the pipes, the housing into which the one of the pipes is inserted; a stopper disposed in an interior of the housing, the stopper held at an initial position of the stopper adjacent to an opening portion of the housing, the stopper moving to a push-in position away from the opening portion of the housing when the one of the pipes is fully inserted; and a retainer attached to the housing to be insertable and movable between an initial position of the retainer and an insert position, wherein the retainer and the stopper each comprise a restricting portion, the restricting portions restricting the retainer depending on a position of the stopper so that: the retainer is able to be inserted into the housing when the stopper is at the push-in position, and the retainer is not able to be inserted into the housing when the stopper is at a position other than the push-in position, wherein the retainer is configured to engage with the housing at the insert position, and wherein the restricting portion of the retainer directly engages the restricting portion of the stopper.