Radiator Overflow Tank 3 in x 10in Black Stainles

The Radiator Overflow Tank 3 in x 10 in Black Stainless by Specialty Products Company (part number 9963BK) is a precision-engineered cooling system component designed for marine and automotive applications requiring reliable coolant recovery. Built from stainless steel with black powder-coat finish, this 24-ounce overflow tank resists corrosion in harsh saltwater and freshwater environments while maintaining structural integrity under thermal cycling. The 10-inch height and 3-inch diameter provide optimal mounting flexibility in tight engine compartments aboard fishing vessels, cruisers, and performance boats.

Specifications are purpose-built for marine duty. The 1/4-inch hose barb inlet and outlet connections accommodate standard marine coolant hose, simplifying installation and replacement on existing systems. Stainless steel construction withstands constant exposure to salt spray, humidity, and temperature extremes that degrade painted steel tanks in offshore conditions. The black powder-coat finish provides secondary corrosion protection while maintaining a professional appearance in engine bays. This capacity and form factor complement mid-range marine cooling systems, capturing coolant overflow during operation and allowing controlled refill as the engine cools.

Weekend recreational boaters and serious offshore fishermen rely on overflow tanks to prevent coolant loss and maintain system pressure during extended runs. Specialty Products Company's proven design is favored for engine refurbishment, cooling system upgrades, and replacement installations where original equipment specifications are either unavailable or performance-oriented alternatives are preferred. Whether rebuilding a classic inboard engine or modernizing an aging cooling system, this stainless overflow tank delivers the corrosion resistance and durability required for long-term saltwater service without premature degradation.