Hi-Tech Duravent Lav Hose now available in TWO styles: Lav Hose: Industry tested, translucent blue, durable urethane, thermally bonded nylon helix. Abrasion, crush and kink resistant, with smooth interior walls and blue cuffs. Lav Hose PLUS: Has an added anti-abrasion wear-strip designed to better withstand rugged conditions of airport ramps.