The seal housing is made from alum. rather than steel so keeping weight down on the hot rod even in little places is always a priority and the seal portion has dual Teflon lips but one lip faces outward one inward giving the seal maximum sealing surface on the blower snout shaft providing run after run of trouble free service.
Seal dimensions are 2.500" O.D. x 1.600" I.D. x .300" thick and will work with all DMPE, Kobelco, Fowler or SCS blower snouts.