Threaded Radiator Inlet/Outlet hose fitting 1.50 for Frostbite LS-Swap Radiators. High-Horsepower street cars and truck can be a challenge to keep cool. A proper cooling system starts with the right radiator. Aluminum Radiators cool more effectively and weight less than older OEM style copper/brass units. These screw-in hose fittings are specifically designed to work with the Frostbite LS-Swap Radiators.