When the seals fail between an upper coolant tee and radiator hose, there typically hasn't been a fix besides buying a whole new coolant tee. This Dorman OE FIX kit offers a cost effective direct replacement of worn O-rings. Product Features:Cost-effective repair - this kit allows you to directly replace coolant tee and radiator hose O-ringsComplete set - includes two large and one small O-ringApplication specific - strictly designed for certain Ford F150 and Mustang model yearsQuality engineering - designed in the United States and backed by decades of automotive aftermarket experience