a compression fitting is for joining, say.. 2 square cut pipes using a ferroule on each pipe and a union that has machined seats and nuts with seats. the ferroule is compressed to seal agains the pipe OD, and into the set in the fitting.
a flare fitting packing nut forces the flare to seat agaist the seat in the fitting.. thus thread pucky is useless.. though in some special cases you can use tape or an oring on a flare as packing.. sometimes.. if you know waht you are doing.
most cases of new flare fittings leaking, if there is no crack marring, or ill fittment ( wrong angle or bent flare ).. is because there was tension on the line and it did not fit against the seat correctly when the backing nut was tightened..
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