I am planning to replace the scupper ball valve and associated thru hull fitting this winter. I plan on using the parts from CD (pictured below). I have a couple of questions about the process. First, is it possible to do on the trailer with the keel up? If so, then next question is do I need the thru-hull installation kit pictured below? How much of this can be done from inside? If anyone has done this, and has any tips or pics it would be greatly appreciated.
