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.