UNC7E All Purpose Polaris Bags(2 Pack) for Polaris 360, 380 Pool Cleaner,Zipper Bag Replacement for Polaris Pool Cleaner Parts

Does it lock on and fall off easily?

How do you remove these from pool sweep. I have an incredibly difficult time removing it without having to rock it too hard to remove it

how can i find the model number of my polaris?>>

I need to return mine as it is three inches across and i need four inches. how and where do i return it? and is it possible to get the four inch bag?