AEROFLOW Performance Billet Radiator Cap – Black, 42mm, 1.1 Bar / 16 PSI

Don’t let a failing or unsightly factory radiator cap compromise your engine’s cooling system or ruin the aesthetic of your engine bay. The Aeroflow Performance Billet Radiator Cap (Part Number: AF64-5043BLK) combines superior structural reliability with a sleek, high-end finish, making it the perfect upgrade for street machines, track cars, and custom builds.

Precision 6061-T6 Billet Aluminium Construction

Unlike cheap stamped steel or plastic caps that can warp, rust, or degrade over time, the top of this Aeroflow cap is precision-machined from premium 6061-T6 aerospace-grade billet aluminium. The result is an incredibly strong, durable, and visually striking component. Finished in a stealthy, corrosion-resistant black anodised coating, it adds a touch of modern, aggressive styling to any engine bay.

Optimal Cooling System Pressure Control

Maintaining the correct pressure in your cooling system is absolutely critical to preventing your coolant from boiling over under heavy loads. This cap is meticulously calibrated and rated to 16 PSI (1.1 Bar / 110 kPa). This slightly elevated pressure rating safely raises the boiling point of your engine coolant, providing an essential safety margin for high-performance driving, towing, or track days.

Direct Fitment for 42mm Large Cap Radiators

This cap is engineered for a seamless fit on any standard 42mm “large cap” water neck. It is universally compatible with a wide variety of aftermarket performance radiators, custom header tanks, and recovery-type expansion tanks that utilise a 42mm filler neck.

Key Features at a Glance:

• Premium Material: Precision-machined from robust 6061-T6 billet aluminium.

• Sleek Aesthetic: Features a hard-wearing, stealth black finish to suit any engine bay.

• Accurate Pressure Rating: Calibrated to 1.1 Bar (16 PSI / 110 kPa) to increase coolant boiling point safely.

• Versatile Application: Suits 42mm (large style) radiators and recovery expansion tanks.

• Reliable Seal: Ensures a leak-free fitment under high temperatures and pressures.

Technical Specifications:

• Part Number: AF64-5043BLK

• Cap Size / Neck Diameter: 42mm (Large Cap Style)

• Pressure Rating: 1.1 Bar / 16 PSI / 110 kPa

• Top Material: 6061-T6 Billet Aluminium

• Finish: Black Anodised

• System Type: Suitable for recovery-type expansion tanks and standard radiators

Ensure your cooling system operates at peak efficiency while looking the part. Upgrade to the Aeroflow Performance Black Billet Radiator Cap (AF64-5043BLK) today. Would you like me to find a matching Aeroflow header tank or weld-on billet filler neck to complete your cooling system setup?