3/8" I.D. XtraFlexmaster tubing is designed to help reduce bacteria build up in the beer lines. Includes stainless steel tail pieces to ensure the best in product purity. The ultra smooth inner wall prevents bacteria build up. Real world testing shows that bacteria count is less after 5 weeks in XtraFlexmaster tubing, than in vinyl tubing after 2 weeks. This brewery approved hose will not rot, swell, or dry out and is unaffected by normal beer line cleaning chemicals.