Radiator Y-Hose Kit. Upgrade the style and performance of your bike by switching out its stock hoses with Pro Circuit's "Y" Radiator Hose Kit. These radiator hose kits feature premium-grade silicone throughout, which can operate at higher temperatures and pressures than a stock rubber hose. The hoses are topped off with a highly pigmented bright blue that will stay vibrant and not fade over time - making the Pro Circuit "Y" Radiator Hose Kit the perfect way to customize the look of your bike while still increasing its performance and functionality. Replaces stock hoses. Made of premium-grade silicone throughout, inside and outside. Designed to eliminate the plastic "Y" elbows found in other radiator hoses. Operates at higher temperatures and pressures than other rubber hoses. Easier to install than stock hoses. Stronger than stock hoses.