Product: Coolant Tank Cap / Coolant Reservoir Tank Cap / Radiator Reservoir Cap / Radiator Overflow Cap — replacement cap for coolant tanks and reservoir overflow systems. Key benefits Restores and maintains proper coolingsystem pressure to help prevent overheating and coolant loss. Creates a secure, leak‑proof seal to protect the engine and cooling components from contamination and coolant leakage. Durable, corrosion‑resistant construction designed to withstand heat and repeated pressure cycles for longer service life. Quick, tool‑ replacement reduces downtime during routine maintenance or emergency repairs. Features and attributes Function: Seals the coolant reservoir and manages overflow pressure to maintain the intended operating pressure of the cooling system. Performance: Built to resist heat, pressure, and coolant corrosion so the cap holds pressure reliably under normal driving conditions. Compatibility: Designed to old or damaged caps on a wide range of vehicles and reservoir designs; intended for use where the original reservoir cap has failed or been removed. Design: Simple twist‑on installation — no tools required — for fast, hassle‑ replacement during maintenance or roadside fixes. Fitment: Replaces existing reservoir or overflow caps to restore proper tank pressure and coolant containment. Practical use scenarios Routine maintenance: a worn or cracked reservoir cap during a coolant flush or service to ensure the cooling system maintains correct pressure. Roadside : Swap in this cap quickly if the original cap is leaking or missing, helping prevent overheating while you continue driving to a facility. Post verification: After replacing hoses or the radiator, install a reliable cap to ensure the system holds pressure and operates as intended. Why choose this cap Focused on function and reliability: specifically built to seal, protect, and preserve coolingsystem performance without complex installation. Reduces risk: a proper seal and pressure control help avoid coolant loss, air ingress, and the potential for engine overheating. What's included One coolant reservoir/radiator overflow cap ready for immediate installation. Note: Confirm physical fitment against your vehicle's existing reservoir cap dimensions or part number before installation when exact OEM match is required.