usually a teflon based sealing compound, teflon tape is ok as long as you stay back one thread from the end like hydraulics so you don't cut the end of the tape off and it travels to some point where it will restrict the flow and oh yes, with teflon its easy to overtighten and split something its so slick. kinda like oiling the threads on bolts etc then torqueing them to specs, the oil is a lubricant so over torqueing is usually the result and failure occurs.
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Irnsrgn
Knowledge must be shared or it lies dead in the mind.
The Blacksmith must use Hammer and Flame to force the iron down the path of his own choosing.
I usually find it much easier to be wrong once in while than to try to be perfect.
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