Help tapping an oil pan

[TurboTravis]

@KrazyKid

Technically speaking, I think an NPT COULD seal without any tape/paste/sealant. The threads AND shank are tapered on the fittings. The bore and threads on the body your attaching it to aren’t. So the deeper you thread in the fitting, the shank, between the threads, actually can bottom out inside the female body and seal it. Picture taking a funnel and jamming it into a rubber cylinder. same concept. But I can only see that work when the female body you is softer metal than the male fitting your sending in it… that way aslong as the threads hold you can tighten it up and actually displace some material inside the female body and create a flare if you will.

I’ve assembled various NPT fittings in a pinch (or laziness) without any paste/tape/etc and they didn’t leak.

/jellies