Flexzion Propane Refill Adapter Lp Gas 1 Pound Cylinder Tank Coupler Quick Connect Attachment For Hot Dog Cart Hunting Camping RV Camper Stove Grill BBQ Patio Heaters Refills 1 lb. bottles in 1 minute or less so quick Fits all one pound tanks and easily refill one pound bottles Hook up the smaller cylinder with this adapter and it will equalize the pressure between the two tanks Built in safety feature that will ensure you NEVER over-fill your smaller tank. The Safety Stream adapter automatically cuts off gas flow when pressure is reached Great for Ice Fishermen, mountain men Outdoorsmen, and all Campers and power outages