Keep your trailer bearings protected and your axle hubs running clean. The Lippert 333963 double lip grease seal is a direct-replacement seal for Lippert, Dexter, and Al-Ko trailer axle hubs across a wide range of load ratings. Buying a 10-pack makes sense for fleet maintenance, multi-axle trailers, or anyone who services their own rig and wants spares on hand.
The grease seal is one of the most overlooked -- and most critical -- components in a trailer hub assembly. Its job is simple: keep the bearing grease in and keep road contamination out. When a seal fails, bearing grease escapes, water and road grime enter, and bearing failure follows. Replacing seals at every bearing repack (typically every 12,000 miles or annually for full-timers) is cheap insurance against a roadside wheel-off event.
Lippert part number 333963 (service/reference number 122088) is a double lip design, meaning it runs two sealing edges against the spindle journal instead of one. The secondary lip acts as a wiper, giving you an added layer of contamination rejection even if the primary lip takes minor damage from road debris or a rough spindle surface.
Two sealing lips provide redundant contamination rejection -- primary lip retains grease; secondary lip wipes away road grime, water, and debris before it reaches the bearing.
Fits Lippert, Dexter, and Al-Ko trailer axle hubs covering load ratings from 1,250 lbs up to 8,000 lbs per axle -- one part number covers a broad range of RV and utility trailer applications.
Ten seals per pack -- enough to service all four hubs on a tandem-axle trailer twice over, with spares left for the toolbox. Ideal for RV dealers, mobile service techs, and owners who repack their own bearings.
Backed by Lippert's limited 1-year manufacturer warranty against defects in materials and workmanship.
A grease seal should be replaced any time the hub is pulled for bearing inspection or repack. Reusing an old seal risks a compromised seating surface that leaks immediately under load. Signs that a seal has already failed include:
This seal is sized for spindle journals and hub bores found on a broad range of Lippert, Dexter, and Al-Ko trailer axles. The 2.25" inner diameter fits the spindle shaft; the 3.37" outer diameter presses into the hub bore. Always verify both dimensions against your existing seal before ordering if you are unsure of your axle series.
Common axle families this seal is used on include Dexter 3,500 lb to 8,000 lb straight and torsion axles, Lippert Axle Solutions axles in the same load range, and Al-Ko axles built to the same bore and journal standard. If your current seal is stamped or bagged with reference number 122088, part 333963 is the correct replacement.
Bearings, hubs, spindle nuts, cotter pins, dust caps, and grease are NOT included. This is a seal-only pack.