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Originally Posted by boosting_laser
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Why does the 90* fitting have left hand threads? I think that may be the wrong part #.
Another advantage to using npt as opposed to metric or sae straight threads is oreintation of angled fittings when tight. With o-rings or crush washers, once it is tight, it is tight. If it is a 90* fitting and pointed 180* opposite of what it needs to be, the only remedy is to start indexing (stacking crush washers or o-rings until it points to where it needs to) which is prone to leak. With npt fittings, once tight, you should have at least120* of adjustment tighter to get the optimal oreintation of the fitting.