Improve your vehicle's cooling system with the Allstar Performance Radiator Hose Restrictor. Crafted from durable aluminum, this restrictor features a 1.75 in outer diameter. It is designed to fit most 1-3/4 inch radiator outlets or hoses, helping to maintain optimal coolant levels and enhance heat dissipation for improved performance. Ideal for motorsport and high-performance applications, this restrictor ensures your engine stays cool under pressure.