I finally got the necessary part and did the repair, took about 15 minutes. No RV supplies near Yellowstone or Grand Tetons. I passed through Casper, WY. and picked up the repair kit at Stalkup RV supplies, very well stocked, friendly and helpful staff. It is a two part seal kit, one other RV supply store tried to sell me a kit with one gasket, they insisted it only takes one. I called Dometic, they said it is a two part kit. Stalkup had the kit with the Dometic number on it.
The base seal kit Dometic number is 385311462.
Thanks for the tips.
Ed & Kathleen
2003 Tiffin Allegro 40'
Jeep Liberty Tow