Brian,

But found none of them that could handle 1o or 12 AWG wire. I don't want to use 18 AWG into the 10 with another butt connector. I am now looking at a different connector set by Perko ( http://www.iboats.com/Perko-Water-Tight-Deck-Connections/dm/view_id.22219 ). It will accept the 10 AWG wire and the rubber backshell will actually fit over the white duplex housing.

If that does not fit well (I need to drill out the opening more) than I may build my own with 2 through bolts to jumper the current from inside to out with simple nuts on the outside. I can then just put a bit of sealant over them...... Well, may be????

Greg