This simple piece is the coolant fill neck for an Aston Martin V8. We removed as part of a cooling system service, and after abrasive blasting, it became apparent that it would need to be replaced or re-made.
The tube has rotted from the inside out along the seam.
The vertical neck and mounting flange are to going to be reused. We took a piece of DOM tubing and rolled a bead into one end to replace the rotted section.
All welded up.
We also went through the water pump on this project. The assembly was torn down, sonic-cleaned before the housing was media blasted, painted with a protective black epoxy, and refitted with new bearings and seals.