CNC Aluminum Fuel Tank Vent Cap – Dirt Bike & ATV Universal

Universal CNC Aluminum Fuel Tank Air Vent Cap

Upgrade your motocross, dirt bike, or ATV fuel system with this precision-engineered CNC Aluminum Fuel Tank Vent Cap. Designed as a universal fit for popular models including CR, CRF, YZ, YZF, KTM, RMZ, KXF, KAYO, BSE, and more, this vent cap delivers superior performance over standard plastic caps — combining rugged durability with a clean, machined aesthetic. Made in Mainland China.

Key Features

• Premium CNC Aluminum Alloy Construction: Machined from high-grade aluminum alloy, this vent cap is wear-resistant, corrosion-resistant, oil-resistant, and anti-aging. It handles the vibration and heat of hard riding without rusting, deforming, or leaking — far outlasting ordinary plastic alternatives.
• Two-Way Pressure Balance Valve: The built-in two-way vent / one-way valve automatically replenishes air as fuel is consumed, preventing negative pressure build-up and poor fuel pump suction. It also rapidly vents fuel vapor at high temperatures or during rough riding to stop excess pressure from breaking the tank seal and causing leaks.
• Spring Diaphragm One-Way Pressure Relief: Compatible with motorcycle brake fluid reservoirs and reserve fluid reservoirs, the spring diaphragm structure automatically vents pressure when fluid expands due to temperature changes — protecting your reservoir from bulging or leaking and extending the life of your oil seals.
• CNC One-Piece Forming Technology: The seamless, one-piece machined construction gives a refined, textured look that suits any motorcycle modification build. It's as much a style upgrade as it is a functional improvement.
• Versatile Compatibility: Universal fit suitable for motocross, dirt bikes, pit bikes, and ATVs from a wide range of popular brands and model series.

Product Specifications

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Learn more: FuelEconomy.gov on vehicle maintenance

Frequently Asked Questions

Q: What bikes and ATVs is this CNC aluminum fuel tank vent cap compatible with?

A: This vent cap is designed as a universal fit and is compatible with a wide range of motocross, dirt bikes, pit bikes, and ATVs — including popular models and brands such as CR, CRF, YZ, YZF, KTM, RMZ, KXF, KAYO, and BSE. Always verify the thread size and cap diameter against your specific model before installing.

Q: Why should I replace my plastic fuel tank cap with a CNC aluminum vent cap?

A: CNC aluminum alloy offers significantly greater durability compared to standard plastic caps. It is resistant to wear, corrosion, oil, and high temperatures — making it ideal for the demanding conditions of off-road and motocross riding. It also features a built-in two-way pressure balance valve that helps maintain proper tank pressure and prevent fuel leaks.

Q: How does the two-way vent valve work?

A: The built-in two-way vent valve automatically draws in air as fuel is consumed to prevent negative pressure in the tank, ensuring consistent fuel flow to the pump. At the same time, it releases fuel vapor when pressure builds up due to heat or rough terrain, protecting the tank seals and preventing leaks.

Q: Can this vent cap be used on brake fluid or reserve fluid reservoirs?

A: Yes. The spring diaphragm one-way pressure relief structure makes this cap compatible with motorcycle brake fluid reservoirs and reserve fluid reservoirs. It automatically vents excess pressure caused by fluid expansion from temperature changes, helping to protect reservoir walls and oil seals from damage.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.