O-Ring for the ABI 3900 Modified Column Rotor. The original column rotor did not have O-Rings to hold the columns. Some customers mofdified the rotors to accept an O-Ring so that the O-Ring can hold the column in place better that the original column. These O-Rings fit in the modified rotor. If your rotor is not modified to accept the O-ring, these will not work in your rotor. 100 Pack
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