Ecoolbuy Propane Refill Adapter Lp Gas Cylinder Tank Coupler Heater Camping Hunt Propane One Pound Tank Refill Adapter for Hot Dog Cart Hunting Camping RV Camper Stove Grill BBQ (2pcs) Condition: 100% Brand New Tank Refill Adaptor. Female throwaway cylinder thread x Soft Nose P.O.L. For personal use only. Refills 1 lb. bottles in 1 minute or less so quick. Works with all 20, 30, or 40 Pound 50,Cylinders. Hook up the smaller cylinder with this adapter and it will equalize the pressure between the two tanks.