Shields Vac Extra Heavy Duty/Commercial Grade Hose has a smooth cover and clear FDA formula PVC with a white vinyl helix.It is rated for full vacuum and is resistant to mild chemicals and saltwater.This hose is primarily used for bilge pump intake and discharge potable water tank fill drains (sinks shower and scupper) livewell intake and drain and sanitation (intake vent and pump out).This hose is utilized for below the waterline connections.Do not use ethylene glycol based antifreeze in hose.Do not use in pressurized water systems.