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I used an Oberdorfer pump for years, continually dealing with seals & leakage. Never was able to get it 'right'. But being raw water cooled, it didn't really bother me - there was plenty more water where that came from.
Then I changed to glycol cooling, and the leakage from the Oberdorfer was suddenly critical - it was like losing blood! Changed to the Moyer pump - no regrets.
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