With the last seacock installed for the cockpit drains, I thought I'd show what I did to get it ready.
I have a sheet of G10 Fiberglass board, I used a couple hole saws to cut to size. Drilled holes for the bolts but then drilled out a larger size on the bottom to epoxy the bolts into place. I had a small tube of LifeCaulk on hand and used it to seal the threads. I think I used 4200 or Sikaflex 291 before but it should still work just the same.
One difficulty was having to use a couple wrenches to tighten the fittings together. Having the pieces already together helped for alignment when installed on the boat.
Really not a lot to it. This is the same way I prepared the other seacocks I've installed with new G10 backing boards.
There's sitll a couple old seacocks on the boat. I'd like to get rid of the one in the starting battery compartment. There's also one in the head under the counter top. Right now, if I tried doing that work, It would further delay getting the boat ready so they're going to wait right now.