I am definitely going to install shut off valves while I have the easy access. I will be able to get to them pretty easily from the hatch in the cockpit floor and can reach them from the access door in the cabin. The question is how to affix them to the fiberglass stubs. Should I cut the stubs flush and install through hulls or epoxy a nipple to the stub. The epoxy nipple would be easier, cleaner and not to mention cheaper but the throughull would be more secure. How have other owners done this?