Alm Filler Cap & Bung Kit 1.5 OD

The Alm Filler Cap & Bung Kit 1.5 OD from MOROSO is a precision component designed for serious engine builders and performance enthusiasts who demand reliability in their cooling systems. This kit provides both a sealed filler cap and matching bung assembly for 1.5-inch diameter applications, making it essential for custom radiator installations, aluminum radiator builds, and high-performance engine conversions where factory cooling ports don't align with your modifications. Whether you're running a street rod, drag car, or heavily modified daily driver, having the correct filler cap and bung solution prevents coolant leaks and maintains system integrity under demanding conditions.

MOROSO engineered this kit with a 1.5-inch outer diameter specification to deliver a secure, pressure-rated seal that handles both street and race applications without failure. The matching bung design ensures proper fitment and eliminates improvised solutions that compromise cooling system reliability; the cap features a vented or sealed design depending on your cooling system requirements, and the precision-machined aluminum or steel construction resists corrosion while maintaining structural integrity under thermal cycling. This attention to detail means you get consistent performance across thousands of miles without weeping seals or unexpected coolant loss during acceleration or braking events.

This filler cap and bung kit benefits custom radiator builders, engine swap specialists, and anyone upgrading from OEM cooling components to aftermarket aluminum cores or custom fabrications. Installation is straightforward—simply size-match your radiator or overflow tank neck to the 1.5-inch OD specification and secure the bung before threading the cap hand-tight, then torque to manufacturer specifications. The compact footprint (5.4 × 1.05 × 7.2 inches) fits in tight engine bay layouts without interference, and the minimal weight (0.15 lbs) has zero impact on vehicle dynamics while delivering maximum cooling system dependability for street, strip, or road course duty.