You're right HD, but I suspect he's referring to the OD. Also: (an excerpt from) http://www.bes.co.uk/products/129.asp Water Waste/Overflow Pipe & Fittings UNIVERSAL COMPRESSION WASTES 32 mm (1.1/4") and 40 mm (1.1/2") nominal fittings which accept BS 5254 and BS 5255 plastic pipe and copper pipe to BS 659 and BS 2871. The flexibility of the compression ring makes these fittings useful for absolete and non-standard systems. Polypropylene. Do not solvent weld. The actual size of pipes are approximately 34.5 mm O.D. x 31 mm I.D.(32 mm), and 41 mm O.D. x <u>36 mm I.D.</u> (40 mm)
Yes, it's 36mm OD. The pipe needs to fit an existing push fit on a Soils Stack Boss. 32mm is too small and 40mm to big???
Waste is measured by bore size. That is the stated size, some manufacturers use thicker walls, especially dafty DIY push fit systems. Look for a brand on the pipe. Best to rip it out and replace with solvent.
you need some welded waste pipe, welded is 36mm and 43mm OD, push fit is smaller 34mm and 42mm OD , any plumbers merchants will sell it or B&Q etc
Cut a small length of 40mm pipe to about 10 inches long. Now cut your 36mm to a good several inches long, long enough to be inserted into the 40mm pipe to approx half way, leaving enough to be joined to the next 36mm joint. Finaly cut a 32mm pipe to size that could meet the 36mm pipe inside the 40mm pipe leaving enough length to fit a 32mm pipe extension joint. Now get busy with a tube of sealant rubbing plenty along the pipes to be inserted into the 40mm pipe then push them in untill they meet roughly at the centre of the 40mm tube. tidy up the seals making sure you cannot see any gaps between the tubing. check that the inside of the tubing is as clear as possible. I sent a wad of kitchen roll down from the 32mm side with a suitable stick to clear out the channel. Now leave it till the sealant cures. Congratulations - You've just made your own adapter.
Original post from 2010 !! Was resurrected last Friday, some ten years later for some reason ?? Gotta be sorted by now