I picked up 2 cmp brilliant wonders led lights that screw into a common return. Cmp sells a water stop "winterizing" fitting but too late for that. People have told me that it's not necessary to have a water stop, but I can't get past the logic of what happens to all of that pool water when you unscrew and pull the light from the return fitting to change it. It's just going to flood the pipe with the wire in it. Am I missing something?