the big difference is ABS can't hole pressure like PVC, so hence it is used in low pressure applications. (sorry I forgot to mention this above) well most low pressure apps happen to be sewage/waistwater so it gets knowen for this whare in reality you can also get potable rated ABS but not pressure rated.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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