ZD50×80×18 Double Spring Combined Skeleton Oil Seal High Temperature Oil Resistant Rectangular Structure For Loader Gearbox Extended Life Seal Describe: Formulated for loader gearbox transmission systems operating under sustained high-temperature duty cycles, this ZD50×80×18 double spring skeleton oil seal utilizes a specially compounded FKM fluororubber lip material with superior thermal oxidative stability. Unlike standard NBR seals that harden and crack after prolonged