Just winterized the TT today. For those of us that have this water heater your drain plug is 1 and 1/16 socket. Having spent a couple hours going back and forth to the store to get the right socket I thought I would save someone the headache of trying to guess what size socket to get for the drain plug. Hope this helps!
I'll also add that 1-1/16" sockets only come in 1/2" drive size...I think. If you were like me, most people have 1/4" and 3/8" drivers. I did not want to buy a 1/2" driver, so know they do make an adapter that allows a 1-1/16" 1/2" driver to connect to a 3/8" driver. Most of you know this, but just thought I would throw that out there.