PERRIN Performance silicone radiator hose kits will add style and form to your engine bay. Made of high gloss vividly colored silicone, PERRIN? radiator hoses are an excellent compliment to your existing PERRIN intake system. The PERRIN? radiator hose kit will replace the two upper and lower radiator hoses as well as the coolant heater hoses on your Scion Xb. PERRIN radiator hoses have a higher burst rating than stock hoses insuring failure won't result under higher pressures.