Could I hook one of these small tanks (they weigh about 20 or 30 pounds full) up to gas connect line and run a small natural gas heater with it? Maybe I could rig up some flexible hose and walk around my yard burning up weeds with it? I don't know. In using these old propane tanks, will it be necessary to use regulators and check valves etc...just to say run a 6 foot rubber hose off of it to burn weeds? I mean: are they THAT explosive that they would require a check valve inline?