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I'm replacing my norwall toilet with a new gerber maxwell toilet I have no guidance though into what exact neoprene or rubber gasket I need. When I picked a zurn one it seemed too large for my toilet. I ordered a rubber sponge one. I just do not know how exactly it fits between the 4 inch discharge pipe and the toilet. Does the neoprene gasket sit inside it or push into the drain pip to make the seal? I also saw a flexible rubber seal that you can push into the 4 inch drain. Lots of options and very little information. I'm often told juat a neoprene gasket but I need more info than that. Thanks in advance!