OTOH, if you make them different diameters you exclude push fit or compression fittings on solvent weld pipe.

Bear in mind (although some disagree) that whilst all solvent weld waste is a standard size across all the manufacturers, push fit isn't. All Brett Martin products including Brett Martin 32mm MuPVC Plain End Waste Pipe Black 3000 x 36 x 36mm are manufactured under a quality management system certified to BS EN ISO 9001:2015 offering you peace of mind that these products will satisfy current industry and legislative requirements. Join three solvent-weld pipes with a pipe tee and prevent blockages with a solvent-weld access plug.

Product Code: FLO-224414 | EAN: 5055149902246 Floplast WS10WH 32mm (36mm) ABS Solvent Weld Waste 90 Degree Bend - White This fitting has a physical pipe fitting size of 36mm and requires Solvent Weld Glue for installation.

Still have not had the chance to ask Screwfix whether they might consider that selling 32 and 40 but supplying 36 and 43 without mentioning it, is a good reason to give me a refund - albeit its a marginal thing whether posting them back is worth it. If it needs adjusting you can always heat the pipe and form a socket to fit the existing, heat gun is good. On the other hand, solvent weld pipes necessitate the use of solvent cement, thereby establishing a strong and permanent seal.Only suitable for Alton Evolution (not Victorian or Heritage models), Elite, Peak, Simplicty and Hercules greenhouse models. This cannot be used directly onto 43mm waste pipe but must be inserted into a 43mm solvent weld fitting such as a coupling or an elbow.