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Originally Posted by supersonicsvt
The compression fittings to use are the two-ferrule design, such as Swagelok (or Bylok, Gyloc, Circlelok, etc - everyone makes knockoffs). If you use this kind you will have no problems whatsoever. Even McMaster-Carr has their version. Just be sure to watch materials - if your PS hardline is stainless or carbon steel, you will have to use a stainless or carbon steel Swagelok fitting or else it won't "swage" the tubing. You can't use a brass fitting and ferrules on a carbon or stainless tube.
Make sure you debur that tubing ID!!!!
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These are all valid concerns. The 2-ferrule type fitting used in this case is of carbon steel -- mated over the steel line. And yes, that line was deburred and cleaned prior to reassembly. Snapshot was taken just after the snip.