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post #4 of Old 09-23-2009
48' wood S&S yawl
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We have a PYI dripless. No issues for the past 5 years. It's made of a stainless collar that rotates against a carbon ring for the seal. A "rubber" (it's probably viton something) bellows keeps the collar and ring in contact. As you'd have to pull the shaft to replace the bellows (that's what would fail, if anything), checking it is required maintenance. But it is drip free.
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