3904006 - Coilover O-Ring – Floating End Cap – 2.0

- €4,00

€4,00

€4,00 - €4,00

€4,00

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OEM: Made by an Original Equipment Manufacturer. This part is made by an original equipment manufacturer or under their license, ensuring compatibility and quality.

Brand Terrafirma

Coilover O-Ring seals the floating end cap of a 2.0-inch coilover damper.

Fitted between the end cap and the damper body bore, the O-ring retains the internal oil and gas charge and separates them at the floating piston. It is a service seal, renewed when the damper is rebuilt or resealed.

Alternative Codes

3904006

Available to order 2–3 weeks

Not currently in stock. Order now — typically ships within 2–3 weeks.

Need it faster? Contact us about express import (2–5 business days).

When will my order arrive?

This item is ordered from our supplier on request. Typical lead time is 2–3 weeks from order confirmation.

Netherlands / Belgium / Germany: 2–4 working days after dispatch.
Other EU countries + UK: 4–8 working days after dispatch.
Outside EU/UK: contact us for an estimate.

Need it faster? Express import available in 2–5 business days — contact us before ordering.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the 3904006 coilover O-ring and what does it do?

The 3904006 O-ring seals the floating end cap of a 2.0 inch coilover damper. Fitted between the end cap and the damper body bore, it retains the internal oil and gas charge and separates them at the floating piston. It's a Terrafirma service seal.

When is this O-ring replaced?

This O-ring is a service seal, renewed when the coilover damper is rebuilt or resealed. Once the damper is opened the old O-ring is typically discarded and replaced, since a perished seal lets the oil and gas charge leak past. Fit a fresh one on every rebuild.

What's the difference between the 2.0 and 2.5 O-ring?

This 3904006 O-ring is sized for the 2.0 inch coilover end cap. The 2.5 inch damper uses a different size, part number 3904043. Match the O-ring to your coilover bore size, since the 2.0 and 2.5 seals are not interchangeable. Confirm your damper size before ordering.