being in a plumbing field, i personaly think that solvent based upvc pipes and fittings (sewerage purpose) are much more reliable then push fit or o-ring type.
the reasons are as follows...
1.solvent jointing is much more cost effective then the push fit..
2.easy installation (no additional precautions are required)
3.doese not effect from freezing or icing conditions.( cold areas)
4.withstand 100 degree celcius boiling water .
and much more

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