CV4 Radiator Hose Kit for KTM 250-300XCW 08-16 Orange. CV4 radiator hoses are made from the highest-grade silicone material available in order to not only improve heat and abrasion resistance, but also improve ease of assembly and disassembly. CV4’s radiator hose kits are available in standard and Y-kit configurations. Y-kits have joints formed into the hoses themselves, reducing the number of fittings and clamps necessary, protecting against leaks and improving coolant flow and efficiency of your bike’s cooling system.