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Can anyone explain why we have two different sizes of waste pipe for solvent weld and push-fit connectors? Why didn’t they just make the push fit connectors a bit bigger so they would push on a solvent weld pipe rather than have the confusion of needing a different size pipe and compression fittings to switch between them? It would make sense for the manufacturers and stockists too in almost halving the inventory they have to carry.
 
Perhaps to stop people inadvertently (or deliberately!) using solvent cement (for PVC pipe) on push fit (polyprop pipe) which wouldn't work!

Seems unlikely as they could do the same with compression fittings which fit on both pipes. Anyone trying to solvent weld a push-fit shouldn’t be plumbing in the first place but not sure it wouldn’t work. A bit like smearing some LSX on a push-fit? Not needed but will just add an extra seal into the mix.
 
Seems unlikely as they could do the same with compression fittings which fit on both pipes. Anyone trying to solvent weld a push-fit shouldn’t be plumbing in the first place but not sure it wouldn’t work. A bit like smearing some LSX on a push-fit? Not needed but will just add an extra seal into the mix.
I meant if both pipes were manufactured with the same o/d, the inexperienced might try to use solvent cement on polyprop pipe and put it into solvent fittings, not the other way round 🤪. Sorry that wasn't clear.
 
I meant if both pipes were manufactured with the same o/d, the inexperienced might try to use solvent cement on polyprop pipe and put it into solvent fittings, not the other way round 🤪. Sorry that wasn't clear.
Even so that’s only a problem because they not only make two “32mm” pipe sizes and from different materials. There is no reason I can see why a push-fit wouldn’t work on an ABS or PVC pipe if it were made with a 1mm larger ID.
 
I meant if both pipes were manufactured with the same o/d, the inexperienced might try to use solvent cement on polyprop pipe and put it into solvent fittings, not the other way round 🤪. Sorry that wasn't clear.

Years ago they used to be the same size and I would yes that’s what’s happened/ why the difference between the two exists
 
Even so that’s only a problem because they not only make two “32mm” pipe sizes and from different materials. There is no reason I can see why a push-fit wouldn’t work on an ABS or PVC pipe if it were made with a 1mm larger ID.

Other way round push fit on solvent weld

Push fit is a different material that’s capable of taking a higher temperature for a longer period without failure
 
Since they are quite happy to sell both materials for waste plumbing I doubt that the high temperature resistance difference is an actual problem.

Yes different kinda of plumbing eg plumbing for safety discharges etc
 

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