Newbie needs help with pool closing

[ReelNut]

Thanks for the reply Waste.... I really have no idea what a gizmo is or does... it was there when I had the pool opened so I guess it just went back for the closing... I found a new pillow so my plan is to backwash the filter until it get below the skimmer the disconnect all line to the pump and put it in storage. The let it drain below the return then put the plug that was in the return when the pool was opened back. Blow up the pillow tie it at both ends then put the cover on... Question..... What is this Orb thing that I have that says its for winterizing?? And what is a Gizmo??? Thanks to all

[Phillbo]

Gizzmo's are used to plug a skimmer, and act as a combination plug & skimmer bottle to prevent damage to your skimmer caused by pool water or rain water freezing in the pool skimmer during the winter.

We recommend wrapping the threads of your Gizzmo with teflon tape to ensure a tight seal when threading it into your skimmer.

[Poconos]

I also cut chunks and strips of eccofoam, same stuff as pool noodles, and pack the skimmer with those. Less water in the skimmer housing and much more room for freeze expansion. the gizmo itself is adequate but I like an added safety margin.
Al

[ReelNut]

So does my plan seem to be correct? What is this orb and what does it do? It's brand new in the package so I hate to see it go to waste. Living in western Long Island a mile outside the city border and just starting to get some leaves and pine needles so I would like to do this next weekend. Do I have to do something with the water chemistry during the course of this week?
Thanks a bunch to all