This livewell hose has a black smooth cover with vinyl helix. It is rated for full vacuum and is resistant to mild chemicals and saltwater. It's primarily used for bilge pump intake and discharge, drains (sinks, shower, and scupper), livewell intake and drain, and sanitation (intake and vent). Can be utilized for below-the-waterline connections. Do not use glycol based antifreeze in hose. Sold by the foot.Inside diameter: 3/4"Bend radius: 3'Vacuum rating: 28Length: 50'Limited lifetime warranty