Hi Tracey,
Once you remove the Multiport valve (unbolt the ring of about 8 bolts on the neck), there will be a 6" hole looking down onto the top of your sand - this is why I cover mine with a Garbage bag. You can put the handle on "winterize", whick opens the valves inside so water and air can freely expand as needed, however, since it is a relatively necessary mechanical component, I feel it is better to store it inside away from the harsh elements.
I don't cap any holes into the pool, I actually lean a board against the side of the pool on an angle so any water that needs to run out can travel down the board and a bit away from the side of the pool - no mouse will ever be able to scale those pool walls - no grip. I haven't had any critters get into the pool - besides, they look for warm places, the pool will not be warm since it is outside.
Don't do anything with the sand, you've backwashed it for a long period of time while draining, so prety much all gook is gone from it, mine's always just as clean come spring time as when i closed in fall. Emptying it can risk breaking laterals, then you have to repair those etc...
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