Which compression fittings work better?
Those with plastic pipe or those with brass pipe?

I prefer plastic for kitchen sinks it works well and is cheaper than brass at least here. I think its really a matter of preference. I have worked with both and they seem to perform equally well.

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Which compression fittings work better?
Those with plastic pipe or those with brass pipe?

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They both will work OK but plastic will outlast brass. Regards, Tom