Deflecto Sewer Hose for RVs, Flexible, 3 Inches Dia. x 20 Feet, Vinyl, Blue (SWR320) Flexible vinyl sewer hose measures 3" dia. x 20' Use for emptying black water and grey water holding tanks of recreational vehicles Suitable for the occasional RV user Durable and lightweight, it is easy to attach Flexible and collapsible for convenient storage