Three-Channel Oxygen Supply Tubing - Special design has three inside channels that help prevent the tubing from becoming occluded. Ideal for home patients where long lengths can cause a potential kinking problem. Available in lengths from 4 to 100. Special or custom lengths available...a Salter service oriented benefit. Note: Oxygen supply tubing also available in smooth bore configuration. Innovative Tubing End Fitting - Vinyl material with sufficient clarity to view patency - Designed with Ribbed Body to permit easy gripping when making connections Rounded and tapered edges to prevent snagging or catching on various surfaces.