Moroso introduces a Ford Focus RS '16-'18, Ford Focus ST '13-'18 aluminum Coolant Expansion Tank, Part No. 63820. Direct bolt-in replacement to stock 2 piece plastic tank. Fabricated Aluminum for strength, factory tanks fail after repeated high heat situations. This aluminum tank can be polished, chromed, painted, powder coated or left as is for a race look. Features a billet aluminum radiator neck that accepts the factory cap.