Puig Rear Brake Fluid Reservoir Cap - Kawasaki ZX-4 RR (2023-2026)

A small change, a lasting impression — the Puig rear brake fluid reservoir cap replaces the standard plastic cover on your Kawasaki ZX-4R / ZX-4RR with a precision CNC-machined aluminium cap that does its job every single day without asking for attention. Available in seven anodised colours, it is one of the easiest, most affordable ways to sharpen the rear-end presentation of your ZX-4RR and protect a component you would rather not have to think about.

Key Features

• CNC-machined from solid aluminium billet (MECANIZADO process) for a precise, rattle-free fit
• Coloured anodised finish resists UV exposure, dirt, and minor mechanical abrasion
• Protects the rear brake fluid reservoir from contamination, dust, and everyday grime
• Direct OEM-replacement fitment — plug-and-play, no modifications required
• Seven colours available to coordinate with your ZX-4RR livery or other Puig Hi-Tech accessories
• Exact fitment for Kawasaki ZX-4R / ZX-4RR model years 2023 to 2026

Everyday Value, Zero Compromise

The stock reservoir cap is purely functional — and it looks it. Swapping it for the Puig aluminium equivalent takes minutes and immediately lifts the quality feel of the brake area. The anodised surface holds its colour wash after wash and does not fade or flake the way painted plastics can. For riders who service their own bikes, having a cap that protects the reservoir properly between fluid changes is a quiet but genuine practical benefit.

The cap integrates cleanly with the rest of the ZX-4RR chassis. Whether the bike lives on the road, sees occasional track days, or has been built up with a collection of aftermarket detail parts, the Puig cap slots in without drawing attention to itself — which is exactly the point.

Protection That Works

The aluminium cap shields the rear brake fluid reservoir against:

• Dirt and dust ingress
• UV degradation
• Light mechanical impacts during normal use

Hi-Tech Finish at a Sensible Price

Puig's Hi-Tech range is built to the same manufacturing standards the brand applies to its race-derived accessories — tight tolerances, durable anodising, and fitment that simply works. This cap pairs naturally with other Puig Hi-Tech parts if you are building a cohesive look across the bike.

Colours and Part References

• Black – REF. 21718N
• Gold – REF. 21718O
• Silver – REF. 21718P
• Blue – REF. 21718A
• Red – REF. 21718R
• Orange – REF. 21718T
• Green – REF. 21718V
• Purple – REF. 21718L
• Titanium – REF. 21718Y

Fitment and Compatibility

• Kawasaki ZX-4R (2023–2026)
• Kawasaki ZX-4RR (2023–2026)

Specifications