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Often inconclusive what the material is by look or feel. Often both Viton and Buna-N are black, but you don't want leaks or poor longevity with this kind of tear-down. Cheap insurance to get the parts from the dealer.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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