Hello, complete novice here. Recently our bath has been incredibly slow to empty, resulting in having to plunge it recently to get any thing moving. After plunging over a few weeks, looking down the hole I could see a bit of scrunched up grey rubber (it had started to flow ok around this point). Not wanting to poke it or push it disconnected the bath and flipped it over to see what it is. Please find pictures attached. This was completely screwed up in the waste pipe. Ive tried placing it back in the waste pip but it just remains flat, which I can only see blocking the water again. Do I need to buy a replacement part/parts? Also I'm a little concerned about this being sealed up properly, a lot of clear rubber came apart on the thread when I undid it. Any help would be hugely appreciated, Thanks.