O-Ring, Silicone, 40 Durometer. Fits Dr. Oligo 48, Biolytic 3900, ABI 3900, Northwest 48. This is for the top Chamber Seal, This is a solid O-Ring. The original O-Ring is a hollow O-Ring. We feel that the Solid O-Ring lasts longer than the original hollow one, 381-4318891
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