Joining all 3 water pipes together (2 waste and 1 rain)

My local Screwfix doesn't stock the solvent cement (no idea why), so you're lucky there. Solvent weld is rock solid if done properly; put the solvent glue on both surfaces
you should only put glue on the outside of a pipe. Putting it on the inside means itll get scraped up into a nice big blob ny the ingoing pipe, and stick proud of the joint inside. This provides a perfect place for solids in the wastewater to start collecting.. One hair, then two.. then some conditioner, then more hair, and before you know it the pipe is blocked solid

Same goes for leaving rough edges if cutting with a hacksaw. Invest in a pipe deburrer, or get good at running a Stanley knife round the inner corner of the cut
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sknodly, your building inspector will happily advise you on your foul and waste drainage alteration plans. It IS notifiable work by the way, for reasons that doggit mentioned earlier - you can't just find any old place that water goes and start dumping **** in it - it's pollution, it's antisocial and it could well realise a serious health hazard for your family and neighbours
cjard, the 2 upper pipes are just the waste pipes not rainwater. All 3 are going down the same gully hole.
Could replace rainwater downpipe with full sized soil pipe below level of the 2 waste branches as Screwfix do some rubber drain pipe adaptors for this. Not sure what discharge into gulley will be like with this set up. Do make sure gulley is connected to main soil/waste drainage sewer.
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Thanks for all. Both of the waste /dirty water bends from the wall are actually solvent weld. No wonder why the standard 40mm push fit pipes does not quite fit in nicely to existing protruding bends.
is there a strap on thing that sits nicely on this square RWP and the other end, holds 40mm pipe?

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