In just one minute or less, you can easily refill your 1-pound bottle from a 20 lb. propane tank with the Mr. Heater Propane Tank Refill Adapter. It is constructed of solid brass, and can open the safety valve in male throwaway cylinders. DESIGN Refill 1-lb. bottle from 20 lb. tank in less than 60 seconds Durable brass construction Opens safety valve in male throwaway cylinders Rubber gasket for sealing Female throwaway cylinder thread x soft nose P.O.L. Weight: 1.0 lbs. Additional Details 1-Year Limited Manufacturer's Warranty Style: F276172Z