Fox Service Kit for Boost Valve Assembly

This kit is designed specifically for Fox Boost Valve assemblies. You should verify your shock's specific model year and damper type against the manufacturer part number 803-00-873 to ensure a perfect match, as Fox produces many variations of internal components.

No, this kit contains the replacement seals and internal parts only. Fox typically hosts detailed service manuals and exploded diagrams on their website, which you should consult before beginning the disassembly of your suspension.

In addition to this kit, you will need standard suspension service tools, including a shock pump, pick set for seal removal, and potentially a specialized damper tool or shaft clamp depending on your specific shock model. It is best to review the service manual for your shock to see the exact tool list required.

Yes, it is highly recommended to replace all seals provided in the kit during a rebuild. Even if some seals appear visually intact, they often lose their elasticity and sealing capability over time, and reusing them can lead to premature leaks or inconsistent damping performance.

Fox generally recommends a full damper service, including the Boost Valve assembly, every 125 hours of riding or once a year, whichever comes first. If you notice a loss of damping control or oil weeping from the shock body, you should perform the service sooner.