Heavy duty sanitation hose for toilet to holding tank, self-draining lines, intake, holding tank vent and pump out applications. Also good for bilge pump intake/discharge, potable water fill, livewell intake/drain, and sink, shower, or scupper drains. Resistant to odor permeation. Smooth white FDA grade PVC w/vinyl helix and rated for full vacuum. Resistant to mild chemicals, salt water, and permeation. Do not use glycol based antifreeze in hose. Not for use in pressurized water systems.