For 5th Wheels and Travel Trailers or where permanent installation isn't possible. Disconnects/stores in easy-to-carry case (included). Uses a 20-amp portable battery (not included). Options include a 10' fixed length sewer hose or a space-saving 21' x 1" diameter sewer hose (retracts to 7'). Models include power leads with battery clamps, universal nozzle with cap, fused switch and bayonet cap. (GW bypass not offered on Tank Buddy models).