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I'm fitting the below outside and plan on connecting the branch to an aco drain. I thought the branch would accept a 50mm pipe but it's slightly smaller so Im guessing the max size it takes is 40mm.
www.toolstation.com
Is there any sort of boss adaptor that I can use to upsize from the 40mm branch to a 50mm pipe? I've seen plenty of reducers like below but I need the reverse if that makes sense?
www.screwfix.com
Thanks

Square Hopper 110mm | Toolstation

Is there any sort of boss adaptor that I can use to upsize from the 40mm branch to a 50mm pipe? I've seen plenty of reducers like below but I need the reverse if that makes sense?
FloPlast Solvent Weld Reducing Coupler 55 x 43mm White - Screwfix
Order online at Screwfix.com. Solvent welded, with ABS fittings. Suitable for domestic and commercial use. FREE next day delivery available, free collection in 1 minute.
Thanks