Piping for heater has outer pipe which is arranged at peripheral side of inner pipe, in which coolant for engine flows, for flowing out heated conditioning air out of heater

摘要

The piping (1) includes an inner pipe (10) in which a coolant for engine flows. An outer pipe (11) is arranged at the peripheral side of the inner pipe for flowing a heated conditioning air out of a heater. Independent claims are also included for the following: (a) a piping connection structure; and (b) a piping joint.