Abstract: A composite seal assembly which includes a retainer element, a retainer insert and an elastomeric sealing unit. The elastomeric sealing unit is bonded to the retainer insert and the retainer insert is thereafter secured in fluid tight relation to a circular opening within the retainer element. The elastomeric seal unit includes a primary lip with a seal band formed by convergent frusto-conical air and oil side sealing surfaces. The retainer element and the retainer insert are formed from resinous synthetic plastic materials and at least a portion of the retain element includes an end face for fluid tight engagement with an opposed end face of a machine part.