The water lock tap comprises a pedestal (20), which is secured to an attachment object such as a washstand, a pipe attachment member (30) for attaching a water supply pipe to the bottom of the pedestal, and a neck (10), which is secured to the pedestal; the pedestal comprises a mesh structure for securing the neck to the outer periphery of the pedestal, and having a ring-like blade section (21) which clips into an attachment hole, provided in the attachment object, and a cylindrical moving member (23) which is suspended from the ring-like blade section and has a plurality of protruding members (24), which are pressed toward the outside when a cylindrical member having a screw notch (31b) in its outer periphery is screwed into a cylindrical space having a screw notch in its inner periphery, the cylindrical member having a slightly smaller diameter than the cylindrical space; the pipe attachment member comprises a screw notch section which functions as the cylindrical member, a flange section which connects to the screw notch section and is accommodated in the ring-like blade section in the pedestal, and a join section which is connected to the water supply pipe.