This Marshall Excelsior Automatic Changeover Regulator automatically redirects LP gas vapor flow from an empty service cylinder to a reserve cylinder, without interruption of service. Specifications•Inlet Size: 1/4 Inch•Inlet Attachment Type: Female Threads•Outlet Size: 3/8 Inch•Outlet Attachment Type: Female Threads•Installation Type: Vertical•Outlet Pressure: 11 Inch WC•Number Of Stages: 2•BTU Level: 225000 BTU Per Hour 1 Stage/ 150000 BTU Per Hour 2 Stage•Material: Zinc•With Shut Off Valve: No•With Hose: Yes•RV Approved: Yes Meet UL, RVIA & NFPA Requirements | Marshall Excelsior Automatic Changeover Propane Regulator