To screw an extension socket to be inserted between an faucet and a steel pipe in the steel pipe by a plyer for a faucet with no other exclusive tool used.

A prismatic portion 10 which an extension socket to be inserted between a water pipe line and a faucet can be rotated around an axis is provided in a place close to the tip end of one handle 11, for threadedly engaging therewith. Practically, previously provided with a portion 11a having a stop cock removing function, which is formed out of a vinyl tube 13, and of a metallic ring 14, the hexagonal prismatic portion 10 capable of being adjusted and fitted into a hole provided along the axial core of the extension socket is provided. Or after a driver part has been provided for the tip end of one handle, the hexagonal prismatic portion 10 capable of being adjusted and fitted in the hole provided along the axial core of the extension socket, may be provided.