ôSani Shieldö Sanitation Hose Premium White sanitation hose for all Head and holding tank connections. Extra thick tube and cover specially compounded for Max. Resistance to odor permeation and winterizing anti-freeze. Helical wire between 2-ply reinforcement provides excellent flexibility bend radius. Longest odor-free performance on the market, but self draining installations still recommended. Not for potable water. Inner diameter: 1-1/2ö