Sierra Shields Bilgeflex Hose 5/8" x 50' - Black Sierra Shields Bilgeflex Hose is a single layer corrugated polyethylene hose. The hose is resistant to mild chemicals and salt water and there is a clamping cuff every foot.Specifications: I.D.: 5/8" or 15.9mm; Bend Radius: 1/2" or 12.7mm; Vac Rating: 20; Length: 50' or 15.2m; Application: This hose is primarily used for bilge pump discharge; Note: Do not attach to thru hull fitting below the water line.