My PB used drain pots on my main drains... the ones with the side and bottom fitting. The pot was set in the gunite, and I have a ring and a lid that go on afterward. My question is, does the ring go on before or after plaster, and is it removable later? I know the cover has 4 screws and can be taken off, but can the ring also be removed? It does not get glued or plastered in, does it? I am asking because I do not think white will blend in with my gray plaster too well, and I might want to change them out down the road... I am not worried about changing the cover, but the ring edge is also visible and I want to make sure it is replaceable later and not a glue in permanent piece that I can't change. I have 8 drains (4 on floor and 4 on walls; for water feature intakes) so I want them to blend in as well as possible.