Li se sitou ki konpoze de ki konpoze de tiyo corrugated, manch rad nèt ak jwenti. The inner tube is a thin walled stainless stell corrugated pipe with a spiral or annular shape, and the outer layer of the corrugaed pipe is made of stainless steel wire of steel tape. Joings yo ak èl yo nan tou de bout nan kawotchou a AR matche ak ekipman yo ak èl nan tiyo kliyan an.