Moroso Weld-In Fill Cap w/Neck/Bung & O-Ring - Black

What you get with this Moroso part is a complete weld-in fill cap assembly. It comes with the neck, the bung you'll weld to your system, and an O-ring to ensure a tight seal. This black-finished cap is designed for custom cooling system setups where a standard radiator cap won't work.

This assembly is for folks building a custom cooling system, maybe for a swap or a performance build where you need to add a fill point. The bung is meant to be welded onto your radiator, overflow tank, or intercooler piping, giving you a solid mounting point for the cap. The O-ring seals against the cap itself, preventing any coolant loss or air intrusion once it's installed and tightened down.