O-Ring, Silicone, 40 Durometer, Hollow. This is the original hollow version by ABI and Northwest. Fits Dr. Oligo 48, Biolytic 3900, ABI 3900, Northwest 48. This is for the top Chamber Seal. In addition to the hollow O-Ring, we offer a solid version that we believe lasts longer than the hollow version. You will find our solid version in this same section 381-100192
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