Clear Anodized Aluminum Knurled Radiator Cap

• Knurled twist-lock cap seals the radiator neck and regulates system pressure

• Clear anodized aluminum finish gives the radiator area a clean, billet-style look

• Fits 2 1/8" SAE "A" size necks, short reach — confirm before ordering

• 16 PSI rating — verify this matches your cooling system's rated pressure

This clear anodized aluminum radiator cap seals the radiator neck and helps maintain proper cooling system pressure at a 16 PSI rating. The knurled design gives a secure grip for installation and removal, while the clear anodized finish adds a clean, billet-style appearance to the radiator area.

This is a universal-fit cap, not vehicle-specific — fitment depends on matching your radiator neck's diameter and cap style to this cap's 16 PSI knurled twist-lock design. Confirm your cooling system's rated pressure matches 16 PSI before ordering, since using a cap rated higher or lower than spec can affect coolant boiling point and system performance.

Neck and Pressure Compatibility
Fits standard-size radiator necks common to many classic Chevy, Ford, and Mopar applications. Confirm your radiator neck's diameter and cap style match this cap's design, and that 16 PSI matches your cooling system's rated pressure, before ordering.

Installation
The knurled surface provides grip for hand installation and removal without tools. Seat the cap fully to ensure a proper seal — an improperly seated cap can affect system pressure even if the PSI rating is correct for your application.

What pressure rating is this cap?
This radiator cap is rated at 16 PSI.

What size neck does this cap fit?
It fits a 2 1/8" (SAE "A" size) radiator filler neck with a short-reach design.

Why might this cap not fit my radiator even though it's rated for my vehicle?
Radiator cap fitment depends on more than pressure rating. This cap requires a 2 1/8" neck with a short reach. Some aftermarket and performance radiators use different neck diameters or long-reach designs, so verify your radiator's filler-neck dimensions before ordering.

What's the difference between short reach and long reach?
Reach refers to the distance from the cap's mounting surface to the pressure-sealing seat inside the filler neck. A short-reach cap is designed for a shallower filler neck. Using the wrong reach can prevent the cap from sealing and regulating pressure correctly.

Will this fit my specific vehicle?
This is a universal-fit radiator cap. Compatibility depends on your radiator having a 2 1/8" SAE "A" filler neck, short-reach configuration, and a cooling system designed for a 16 PSI cap, rather than vehicle make or model alone.

What happens if I use a cap with the wrong pressure rating?
A cap with too low a rating can release pressure and coolant earlier than intended. A cap rated higher than the cooling system was designed for can place additional stress on the radiator, hoses, heater core, and other cooling-system components. Use the pressure rating specified for your cooling system.

Does this cap fit both press-in and threaded radiator necks?
No — radiator caps must match the specific filler-neck locking and sealing design. Do not assume compatibility with both threaded and conventional bayonet-style necks based only on diameter and reach; verify the neck type before ordering.

Is this cap just for appearance, or does it function like a stock cap?
It's a fully functional 16 PSI radiator pressure cap, not simply a decorative cover. The clear anodized finish provides the appearance upgrade while the cap regulates cooling-system pressure.