| 摘要 |
A heater pipe (1) comprises an inner pipe (10) causing the engine cooling fluid to flow into a heater and an outer pipe (11) arranged on the outer peripheral side of the inner pipe (10) for causing the engine cooling fluid having heated the air-conditioning air in the heater to flow out from the heater. A joint (2b) includes an internal peripheral chamber (20), an outer peripheral chamber (21) arranged on the outer peripheral side of the inner peripheral chamber (20), a first branch joint portion (22) communicating with the inner peripheral chamber (20), and a second branch joint portion (23) communicating with the outer peripheral chamber (21) and arranged independently of the first branch joint portion (22). The heater pipe (1) and the joint (2b) are connected to each other by one action by engaging a pipe-side engaging portion (14) and a joint-side engaging portion (260) each other.
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