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The one on the right, in color, is what it looks like

OK, I just closed and then opened the angle stop under the toilet and that did not work. It's so loud that I'm afraid that I'm disturbing my neighbors, so I'll do it again (and your 2nd suggestion if...

The first level toilet makes a lot of noise after flushing, right as it is about finished filling up, lots of banging, and it's just getting worse as time goes on. After looking this up a bit it...