The Moroso Radiator Cap (34–38 psi) is designed for high-performance and racing cooling systems requiring consistent pressure retention and durability. Featuring a precision-calibrated steel spring, this cap maintains accurate pressure settings over time to ensure optimal cooling efficiency. The six-sided design provides a firm grip for quick installation and removal, while compatibility with standard-size filler necks ensures universal fitment across many Moroso and OEM applications.

Moroso 63333 Radiator Cap Features:

• Maintains 34-38 psi pressure rating for performance cooling systems
• Fits standard-size radiator filler necks
• Compatible with Moroso filler necks; 63420, 63465, 63466, 63467, 63485, 63486, 63650, 63651, 63656, 63730, 63740, and 63745
• Precision steel spring maintains accurate pressure calibration
• Six-sided cap design for easy tightening and removal
• Constructed for long-term strength and sealing integrity

Moroso 63333 Radiator Cap Notes:

• For use with standard radiator filler necks only
• Inspect sealing surfaces before installation to ensure proper fit
• Choose pressure rating appropriate to system requirements