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This 4oz Wilwood Billet Aluminium Brake Fluid Reservoir is designed for automotive enthusiasts and mechanics seeking a compact and durable fluid storage solution for brake or clutch systems. Its key benefit is direct mounting to compatible Wilwood master cylinders, saving space and simplifying installation. A potential caveat is its specific thread size (11/16''-20), which may limit direct compatibility with non-Wilwood master cylinders. The reservoir features a smooth billet aluminium body, a secure screw cap with an internal bellows seal, and a 4 oz fluid capacity, making it ideal for custom builds or tight engine bays.