| 摘要 |
PROBLEM TO BE SOLVED: To provide an adapter for circulating bathtub water completed as a single independent unit, capable of assembling an apparatus easily available for both functions of natural circulation and forced circulation therewith, having sufficient reinforcement of parts susceptible to external force in terms of strength and maintaining sufficient circulation of bathtub water. SOLUTION: As an independent unit are formed a pair of circulation pipe parts 40 connected with a pair of up-and-down circulation joint ports on a bathtub side, a water room part 50 projecting the circulation pipe parts 40 to up-and-down positions, a pair of forced circulation joint pipe parts 60 projecting from the water room part 50 in a state of being separate from the circulation pipe parts 40 and connected with a pair of forced circulation piping, and a pair of inner pipe parts 70 projecting into the inside of the water room part 50 in a state communicating with each of the forced circulation joint parts 60 and of which each of projecting edges is allowed to extend to an intermittent position inside each of the circulation pipe parts 40 and to open into double tube shapes.
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