Ah, Bushwhacker wrench, got it.
I don't have the can yet... it should be here +/- the end of the month.
In the pictures, I don't see anything on the can body to "grab" unfortunately.
I was thinking about making a set of wood vice blocks by cutting a 1.5" hole through a block of wood, cutting the block in half, and seeing if that would let me clamp the can without damage, but any additional thoughts on best practices for installation of the adapter would be appreciated. With the can body appearing perfectly smooth, I don't think I'm going to be able to get opposing wrenches on it, unless there is something I'm not thinking of.
If the wood blocks don't work, I guess it will just be whatever torque I can get on it literally by hand.