Moroso Chevrolet Big Block/Small Block Water Outlet Filler Neck -16An w/O-Ring - Aluminum

Moroso is well-known for making performance parts for racing and street applications. This water outlet filler neck is a solid option for Chevrolet Big Block and Small Block engines when you need a reliable way to fill your cooling system. It's made from aluminum, which is lighter than steel and won't rust.

This filler neck features a -16AN fitting, giving you a secure connection point for your coolant lines. It also includes an O-ring to help ensure a good seal against the engine block, preventing leaks. This part is often used in custom cooling setups where the factory filler neck isn't suitable or when upgrading to AN-style plumbing.