Premium Sanitation Hose for all head & holding tank connections. Extra thick tube & cover is specially formulated Black EPDM Rubber for Max. Resistance to Odor Permeation and winterizing with antifreeze. With wire helix between 2 ply reinforcement this hose has excellent bend radius, flexibility, and fitting acceptance and retention. This makes for easy installations with no heat gun or lubricant necessary. It’s Legendary odor-free performance is the best on the market. Self draining installations still recommended. Not for potable water.