Upgrade or replace your radiator cap with this sleek Be Cool 71001 billet aluminum cap. It's not just about looks – though the polished finish does add a nice, clean touch to your engine bay. This cap is designed to maintain the proper pressure in your cooling system, rated for 12-15 PSI. The right pressure helps prevent overheating and boiling, keeping your engine running at the right temperature. It's a round cap with standard threads, so it should fit a wide range of radiators (always double-check compatibility with your specific vehicle). The billet aluminum construction is durable and resistant to corrosion. It measures about 3x3x2 inches. A simple, affordable part that can be an important piece of your cooling system's performance and reliability. Perfect for hot rods, custom builds, or as a reliable replacement for a worn-out stock cap.