Originally Posted by jimNC

Get a 10mm hex 3/8 socket. If you use an L-wrench you might be able to get it off (by sliding something over the handle for more leverage) but if you use a socket you can actually torque it back on there at the correct setting (25 ft-lb).

I've got a pretty large socket set but no hex sockets so I just bought this one singly. Just hope I don't lose it since I don't use it for anything else

If you are gonna use an L-wrench then make sure you break the fill plug first, in case you can't break the drain plug. Probably should do it in that order regardless.

Edit: if you have a torque wrench it is probably 1/2" drive so either get a 1/2" socket or make sure you have a 1/2" to 3/8" adapter.