Mounts in-line between supply and regulator on a motorhome to allow connection of an additional propane appliance such as a tabletop grill, camp stove or lantern. Female P.O.L. x excess flow soft nose P.O.L. x 1"-20 male throwaway cylinder thread. 66-8909 includes 12' extension hose with 1" swivel x 1" female swivel (for disposable cylinder) One year warranty. 1/pack.