Originally Posted By: OldBaldGuy
Make sure that the yard sale propane tank has the triangular shaped knob. That indicates that it has an OPT valve in it. Those with round knobs can not legally be refilled now...


I actually had the same thought after I wrote my post. Where I live there is a system/company called Blue Rhino (?) that stocks a propane exchange in front of gas stations and some grocery stores. You take a empty tank to them and exchange for a full one. The cost is $18 +/- $2 for fuel costs. Its a bit cheaper to fill an existing tank at a propane filler.

I would buy a tank at a yard sale and then do an exchange.
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