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Registered
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,914
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Polybutene-I is very good. It has a life expectancy of over 50 years. The old crap, odinary Polybutene, is bad news and should be replaced imediately - other than having it burst inside walls and ceilings.
The old stuff is generally colored black and the new stuff grey.
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