If anyone's contimplating the
B&M Drain Plug I have a suggestion. If you install it as directed, it may come loose while removing the 1/8"NPT plug, or trans sender if you've used it for that purpose. Here's what we do.
Install it as directed except do not install the plastic seal. So you'll have a hole in the side of your pan with the drain bolt going through it and a nut on the backside. Tighten it real good and then tack weld a couple of beads on the nut. The Nut is on the inside of the pan. Then remove the drain bolt/plug and reinstall it now with the plastic seal. Now when you remove the drain plug or sender, the nut on the inside of the pan will not come loose bacause it's tacked there.