Lip Seal The main function is to exclude the ingress of dirt, dust, water or any other extraneous substances. Lip Seal Profile: Showing PictureType: SB- Single Lip Metal Case O.D. With Spring Cross Reference: B, B1, DF, BB, BE, WB, Type 44, Model 76, B1UMaterials: NBR, HNBR, VITON, Silicone, EPDM, ACM, PTFESpring Make: Carbon Steel - Stainless AvailableMetal Case: Carbon Steel or ...