Sunset Durable CPAP Tubing with 22mm Cuffs 18" L, Gray, Latex-Free CPAP tube is compatible with nearly all CPAP, BiPAP and Bi-level systems. CPAP hose tube is used as an extension to current standard hose tubing or used to connect an external humidifier. Smooth interior and a corrugated exterior for excellent flexibility and unrestricted interior flow characteristics.