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I want to install a small sink in a utility room for light washing duties. The sink will be a small one (200 x 340 approx) as the worktop is narrow.I'm thinking a 32mm outlet through the wall to a gulley then underground to a nearby sewer inspection chamber. The length of the underground is about 2m. I would cut a hole in the chamber brickwork about halfway up to discharge. What size and type of pipe can I get away with underground? 50mm or rainwater downpipe size? Many thanks.