I have fitted a shelf in my bathroom vanity unit and unfortunately have cut the waste pipe hole that goes through it too large (used a jig saw instead of getting a hole cutter). I know I can get ones to go over the hot/cold feeds but I can't find one to go over a 32mm waste pipe. i'm sure i've seen them before I think they are a flat plastic ring with a slit in them, doing a web search hasn't thrown anything up.
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