Dual Construction A/C Pipe
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
The A/C pipe unit installed between the engine compartment and the evaporator is the dual construction type.
The discharge pipe (high pressure) is built inside the suction pipe (low pressure).
This design is effective for lowering refrigerant temperatures in the discharge pipe, which helps to improve cooling performance.