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Registered
Join Date: Jun 2002
Location: Winnipeg, MB, Canada
Posts: 3,963
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Cast Iron can rust internally. Looks fine from the outside but can be badly blocked inside.
"Sounds like your shower is down stream from the kitchen sink. Have a plumber come out and snake it from the shower. At the same time, have him snake the p- trap in the kitchen"
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Bunch of old cars 
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