Silicone Milk Tubing is absolutely sanitary and due to tightly bonded non-reactive pure resins unaffected by milk fat or bacteria. Perfectly hygienic with a longer life span than other types of milk tubing when used properly silicone tubing is as strong as plastic more flexible than rubber and can withstand -20° temperatures and boiling wash water. Stays transparent and resilient longer than plastic tubing. Not recommended for use with automated pinch valves. 5/8" ID 1" OD.