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These types of lawn rollers are very handy, however I want to congratulate you for staying alive. LPG tanks are bombs waiting to happen when welding or cutting on them
I am not sure why you felt the need to add a bung as in the center of the top of LPG tanks of that size and larger the valves are threaded into a 3/4" pipe socket anyway. You should have had the tank filled with water before even attempting to weld on it and even then since LP permeates into the pores of the metal they can still be flammable if any air cavity remains. you could have simply have welded one of the bolts you used as your axle to a bung that would have screwed into the valve socket.
Water is heavier than vegetable oil though by the way. pour some into a clear beaker then add ant amount of water you like and the water will flow straight through the iol to the bottom. Water is heavier than most other liquids but the amount of weight in the size tank you have will not be signifiacant enough that you will notice a lot of difference when rolling it across your lawn. Good luck and be safe
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