Keeping water from comming up the drains

[NOTHING ELSE MATTERS]

You can do this, cut a round piece of about 1/16" thick rubber round a little bigger than the opening on the hull drain fitting and screw one screw on top of the circle on the deck fitting to create a "gate" kinda thingie, or you can buy that thruhull fitting in stainless only, but big $$$$$, Grady is using them.