Garden tubings are Colour Transparent unreinforced PVC hose with a smooth interior is available in 1/16" to 2" diameters, and comes in standard coil lengths and multiple pressure ratings.
There is a mirror-smooth finish to the hose to provide excellent flow characteristics. It does not impart any taste or odor, and is lightweight and yet tough and abrasion resistant.
Applications are varied, and include a variety of weak chemicals and gases, including food products, and is easily flushed and cleaned. FDA, USDA, grade.