The Dura-Pump™ DEF Top Unload System comes with a 12 Volt Dura-Pump™ DEF chemical pump. In addition to the high-flow DEF Dura-Pump™, the system contains a 1″ telescoping downtube, automatic nozzle, ¾” × 18 ft. discharge hose and all necessary hose clamps and fittings. This system can be mounted to the top of a 35/50 gallon drum. Can be used for totes with RPV type valve.