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most fittings are flare type, but some have to be pipe thread by necessity. those regulators they sell have a threaded 3/8" hole in the bottom without any specific sealing method recommended, and the only way it can be closed is by using pipe thread fitting (and special gas pipe compound, I suppose, at least thats what I got). Same goes for a solenoid - it has a flared fitting on one end but a regular NPT female on the other. This is the stuff those boating gas companies sell, in fact none of their own parts fit together without lots of connectors. Irritating.
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