Shields Vac Extra Heavy-Duty/FDA Hose has a smooth white FDA grade PVC with vinyl helix. It is rated for full vacuum and is resistant to mild chemicals, permeation, and saltwater. This hose is primarily used for bilge pump intake and discharge, drains (sinks, shower, and scupper), livewell intake and drain, potable water tank fill, and sanitation (toilet to holding tank, intake, self draining lines, vent and pump out). This hose is resistant to odor permeation. Do not use ethylene glycol-based antifreeze in hose. Do not use in pressurized water systems. Sierra Part #116-148-0346W.