Patent ID: 8652032

Claim:
A plug body provided on the external surface of an endoscope and attached to a tubular opening portion that leads to a channel within the endoscope, the plug body comprising: a tubular plug main body into which the opening portion is inserted; a tubular fixing member rotatably or slidably held in the plug main body, having an insertion hole into which the opening portion is inserted, and a claw provided on the inner peripheral surface that forms the insertion hole, and movable to respective positions including an engagement position where the claw engages an engaged portion provided at an outer periphery of the opening portion inserted into the insertion hole, and one or more non-engagement positions where the claw does not engage the engaged portion, and a ratchet mechanism provided in mutually opposed faces of the plug main body and the fixing member, permitting the fixing member to be moved to the respective positions in predetermined order, and stopping further movement of the fixing member to a position where the fixing member has moved once.