I am replacing my current MED (silver) housing with a DSN (black) with provision for a temp sensor.
The thread size on both housing for the oil drain line are 1/4NPT.
On the MED housing the taper seals up no problem:
However, in the DSN housing it never really seals on the threads and the union screws all the way in until the shoulder of the union fouls the housing (at least it seems like that).
Measuring the first threads the MED:
The DSN:
While threading the union into the DSN housing it certainly feels a lot looser than it does with the MED housing.
I wonder if there is a problem? Or do I worry about nothing?