Ford Style Expansion Tank Aluminum Weld Flange with Cap | with Integrated Cap Indexing Tab

Ford Expansion Tank Aluminum Weld Flange / Fill Neck with Integrated Cap Indexing Tab

Designed specifically for Ford expansion and degas tank applications, this CNC-machined aluminum weld flange and fill neck features an integrated indexing tab that locks the cap in the factory orientation. This ensures proper cap alignment, clearance, and a clean OEM-style install—no guessing, no misalignment.

Machined from high-quality billet aluminum, this weld-on fill neck offers superior strength and durability compared to stamped or cast alternatives. The precision-cut neck provides a consistent sealing surface for factory-style caps, while the built-in locking tab positively locates the cap exactly where Ford intended it to sit.

Ideal for custom aluminum expansion tanks, radiator overflow tanks, and coolant reservoirs where maintaining factory cap position and function is critical. Perfect for performance builds, restorations, and fabrication projects that demand OEM fitment with upgraded materials.

Features:

• CNC-machined billet aluminum construction

• Weld-on design for custom expansion and degas tanks

• Integrated cap indexing tab locks cap in factory position

• Compatible with factory Ford-style expansion tank caps

• Strong, corrosion-resistant, and built for long-term reliability

Specifications:

• Weld flange OD: 68mm | 2.67″

• Required hole size: 52mm | 2.05″

• Overall height (without cap): 38.5mm | 1.51″

• Overall height (with cap):

• Weight: 126g | 4.5oz

What’s Included:

• CNC-machined billet aluminum weld flange

• Plastic Cap 21psi | 1.45bar

Installation and Functionality:

This flange is a weld-on style flange, the pressure relief hole is located at the bottom. This means that you will need to weld a tube that will allow fluid to be relieved outside of the tank. Position is not important, could be on the bottom or any of the sides. Please see the photos for reference.

Please note: Not all caps will work with this flange. Some caps have a different design and there is a possibility that it may be incompatible with this weld flange.