Description
This O-ring, part number 486000524, is a replacement part. It is made from a material called FKM. You might also know it as Viton®. This material is tough. It can handle high heat and harsh chemicals better than ordinary rubber.
This specific O-ring is used in a few Busch vacuum pump models. You will find it in the:
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Busch COBRA NC 0400 B
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Busch COBRA NC 0630 B
It is a key part of the maintenance kits for these pumps.


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