Flexible hose

A flexible hose for use as a refrigerant passageway in a vehicular refrigerating cycle, comprising:

• a cylindrical inner hose formed from resin having flexibility;
• a cylindrical outer hose formed from resin having flexibility and covering the inner hose with a space in a given distance,
• wherein the inner and outer hose are configured to allow high pressure refrigerant of the cycle to flow through an interior of the inner hose and low pressure refrigerant of the cycle to flow through a space between the inner hose and the outer hose,
• an inner sleeve-like conduit coupling retained fixedly by a distal end of the inner hose;
• and
• an outer sleeve-like conduit coupling retained fixedly by a distal end of the outer hose,
• wherein the inner conduit coupling and the outer conduit coupling are configured so that pressing an outer circumferential periphery of the outer conduit coupling after inserting the inner conduit coupling into the outer conduit coupling allows the inner conduit coupling to be fixedly retained with the outer conduit coupling.