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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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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