Sierra Shields Bilgevac Hose 3/4" Sierra Shields Bilgevac Hose is a black PVC hose with a flexible vinyl helix. The hose is very flexible, abrasion resistant and is resistant to mild chemicals and saltwater.Specifications: I.D.:; 3/4" or 19.1mm; Bend Radius: ; 3/4" or 19.1mm; Application: Primarily used for bilge pump discharge and drains (sinks, shower, scupper, and livewell); Note: Do not attach to thru hull fitting below the water line.