The hole in the floor on the basement for your water connect, etc. has always been a sore spot for me, and some of you other guys. This is what I have done to close it up and still be able to hook my water up,plus keep the critters out.
With this setup I don't have any dripping or leaks, and if it did leak it would run out the hole in the city water connection I used.
This is what it looks like to start with in the basement.
I removed the fitting that closes the hole.
These are the parts I used. The fitting (city water connector) is on the left,and can be purchased at any RV shop. (I think) You have to knock the one way valve out of it.The wood parts I made, should be one more there,but I guess that one was camera shy. The two black parts are what I removed from top side.
Finished view from top.
Looking up from the bottom with the cap off ready for the water hose.
View from bottom with cap in place.
Should close it up just fine and keep it nice and clean.