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Hi im installing a wetroom shower tray the trap that comes with it is 50 mm diameter I was going to run in 50 mm waste pipe / Elbows and Tees the under floor in solvent weld , and as it goes outside into the stack in push fit ( for ease of getting into if there is ever a blockage ) trouble is the not much of a selection in 50 mm as there is in 40mm ( i want it in black outside and pushfit ) so if i go down to 40 mm will that massively reduce the flow I know you can get a reducer straight after the trap outlet ? cheers