Flexible conduit

Conduit assembly for the conduction of fluids and including an inner and an outer tube, the outer tube being helically or annularly corrugated having alternatingly inwardly and outwardly extending corrugation crest, whereby each corrugation crest on the inside is a corrugation valley on the outside, the improvement comprising:

• the inner tube being flexible and without corrugations, the inner tube having ribs extending in radially outward direction and engaging the inwardly extending corrugation crests of the said outer tube, said ribs running predominantly or exclusively in longitudinally axial direction, thereby extending transversely to said corrugation crest, so that fluid can flow in axial direction along the outside of the inner tube, across the corrugation crests.