Moroso radiator cap 32 lb pressure — 32‑psi spring‑loaded replacement for standard filler necks, USA made

The Moroso 63332 is a 32-pound-pressure radiator cap engineered to fit standard filler necks and keep your cooling system operating at its intended pressure.

Designed and manufactured in the United States, the Moroso 63332 replaces a radiator cap with a reliable spring-loaded valve calibrated for 32 lbs of pressure. It is part of a family of caps offered in both low and high pressure ratings so you can select the appropriate specification for your engine’s cooling requirements. Compact and lightweight, the cap ships in minimal packaging suitable for quick replacement jobs.

Which vehicles and filler necks does this cap fit?

This cap is made to mate with standard-size radiator filler necks found on many passenger and performance vehicles. It is not specific to a single make—measure your neck diameter and thread type to confirm compatibility before purchasing. If your vehicle requires a specialty or non-standard neck, consult the manufacturer’s fitment guide.

• Compatibility: standard radiator filler necks
• Universal fit approach for many consumer and performance cars
• Confirm neck dimensions when in doubt

How does the 32 lb pressure rating affect cooling performance?

A 32 lb cap raises the boiling point of coolant by holding higher system pressure, which can help improve coolant temperature tolerance under load. Choose this rating only if your cooling system and manufacturer specifications call for a higher-pressure cap. For systems needing lower pressure, Moroso offers alternate ratings.

• 32 lb rating increases boiling point compared to lower-pressure caps
• Helps maintain system pressure under operating conditions
• Available in low- and high-pressure variants to match system needs

What ensures this cap remains accurate over time?

The internal steel spring is engineered to maintain its calibrated pressure setting through repeated cycles. That spring resilience helps the valve open and reseal consistently at the designed pressure point, providing predictable behavior over routine service intervals. Periodic inspection is recommended as part of regular cooling-system maintenance.

• Durable steel spring maintains pressure calibration
• Consistent valve operation cycle after cycle
• Simple visual inspection can reveal wear or damage

What are the package size and origin details I should know?

The cap is compact and lightweight, measuring approximately 3.048 cm high by 18.288 cm long by 14.986 cm wide in its retail packaging and weighing about 0.2 pounds. It is produced in the United States, meeting domestic manufacturing standards. These small dimensions make it easy to ship and store until installation.

• Package dimensions: 3.048 H x 18.288 L x 14.986 W (cm)
• Package weight: roughly 0.2 pounds
• Made in the United States

Who is this for: The Moroso 63332 32 lb radiator cap is aimed at drivers, performance enthusiasts, and mechanics who need a higher-pressure, reliable replacement for standard radiator filler necks. It suits those who have confirmed that a 32 lb rating matches their cooling-system requirements and prefer a domestic, spring-loaded cap engineered for consistent pressure control.