Have waste pipes from sink and washing machine (in kitchen) draining to a downpipe in 2nd floor flat (built ~ 1970s). Downpipe is located in corner. Appears to be 80mm diameter. We need to lower both drains (from sink and washing machine) and therefore connector to downpipe (for new kitchen). Any ideas on how to change and adjust fittings to downpipe, and where to get the necessary fittings?
Thanks for the help