They seemed to screw in unusually deep. I've noticed this with two separate assemblies, 1/8"NPT and 1/2"NPT. I found it a little strange, but unfortunately I didn't get a chance to test the leak until 2 months later. 1/8" leaks (gauge adapter) and feels the same as the one I put in the fuel pump (not tested yet). 8" outlet on 2 different parts from 2 different suppliers. 1/2" threads in the engine block but based on the feel I'm pretty sure it's probably leaking as well. Not great as not that easy to replace. Too late to return them. to find some who fit, really disappointed.
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