Motorad MRD509 Spec-R Safety Lever Racing Radiator Cap 18-22 PSI

The Motorad MRD509 Spec-R Safety Lever Racing Radiator Cap is engineered specifically for the high-pressure and high-heat demands of racing and high-performance cooling systems. Rated at 18–22 PSI, it raises the coolant's boiling point to help your engine run at peak efficiency under the most extreme conditions.

The integrated safety lever locks the cap securely to the filler neck, requiring the lever to be lifted prior to removal. This action opens the pressurization valve and safely vents pressure through the overflow tube before the cap can be taken off — a critical safety feature when working around a hot cooling system.

Key Features:

• Spec-R Racing Design — built for high-pressure, high-heat performance cooling systems
• 18–22 PSI pressure rating — raises coolant boiling point for maximum engine protection
• Safety lever locking mechanism — prevents accidental removal under pressure
• Pressure venting — lever lifts open the vent valve before cap release for safe operation
• EasyGrip design — facilitates simple installation and removal
• Premium OE-quality materials — engineered to meet or exceed the highest quality standards
• Factory tested — each cap is tested prior to shipment

The MRD509 is part of Motorad's Spec-R lineup, purpose-built to maintain proper system pressure in the most demanding racing and performance environments, delivering consistent results lap after lap.