CIRCULATION TOOL FOR BATHTUB

PROBLEM TO BE SOLVED: To provide a circulation tool for bathtub for simplifying the configuration of a connection section between an external cylinder and a joint to easily achieve assembling and for preventing water leak in the connection section.SOLUTION: A circulation tool 10 for bathtub is configured of an external cylinder 11 arranged on the external surface of a side wall 12 of a bathtub and an internal cylinder 50 arranged on the internal surface of the side wall 12 and assembled in the external cylinder 11. The external cylinder 11 is formed with a connection cylindrical section 16 to which a going side pipe 15 which sends heated water heated by a water heater to the inside of a bathtub is connected and a coupling cylindrical section connected to a return side pipe which returns bathtub water to the water heater. The connection cylindrical section 16 and the coupling cylindrical section are integrally formed with a joint body 23 of one-push type first joint and second joint 18 so that both can be connected only in accordance with only the inserting operation of the going side pipe 15 and the return side pipe.