PURPOSE: To overflow fluid from an opening part for eliminating troubles of a hose getting out of a faucet when the hose is bent and trampled to increase the internal pressure in the hose, by forming the opening part in the side of a tubular member so that the opening part is opened and closed by a pressure valve for closing the opening part against fluid pressure.

CONSTITUTION: A tubular member is formed on one end with a connecting part 4 to be fitted in a faucet and on the other end with an inserting part 5 in a hose. The tubular member is formed on the side with a groove 6 in which an opening part 2 is formed and an expandable ring-like valve 3 is attached. This valve 3 is formed to a size for fastening the groove 6 and closes the opening part 2 by the fastening force. In use, when the faucet is opened to pass fluid through the hose and the hose is bent to provide high fluid pressure in the hose, the valve 3 is opened by the fluid pressure. As a result, the rise of the fluid pressure is restrained to pervent the hose from separation form the faucet.