Genuine Lippert replacement dust caps engineered for Super Lube trailer hub assemblies. This 2-pack covers both hubs on a single axle and keeps bearings, grease, and internal hub components sealed against dirt, water, and road debris -- with a removable rubber plug for grease fitting access without pulling the cap.
The Lippert 2023134011 is a direct-fit, press-in dust cap designed specifically for Lippert Super Lube hub assemblies on 7,000- to 8,000-lb trailer axles. These hubs use a 2.72-inch bore -- a common size on heavier single-axle and tandem-axle travel trailers, fifth wheels, and toy haulers.
Each cap is built from zinc-plated steel for corrosion resistance and presses firmly into the hub bore without threads or fasteners. The included rubber plug seats in the center of the cap over the grease fitting port, so you can inject grease through the Zerk fitting without removing the entire cap -- a major time-saver during routine lubrication intervals.
Interference-fit into the 2.72" hub bore -- no threads, no hardware. Seats securely against road vibration.
Center plug pops out for grease gun access to the Zerk fitting. Reseat and go -- no cap removal needed.
Corrosion-resistant finish holds up to road spray, humidity, and seasonal storage without premature rust.
Two caps per package covers a complete axle end. Stock a second set for roadside spares or scheduled maintenance.
Lippert's Super Lube (also referenced as "Ez-Lube" in some older Lippert documentation) is a grease system integrated into compatible hub/spindle assemblies. A Zerk grease fitting on the spindle allows grease to be injected through the hub and distributed to both the inner and outer bearings from a single point -- without disassembling the hub. This design requires a dust cap with a center access port, which is exactly what the 2023134011 provides.
If your existing dust cap is cracked, deformed, or missing the rubber plug, grease can escape and contaminants can enter -- leading to premature bearing failure. Replacing caps as a pair at each service interval is low-cost insurance against a roadside breakdown.
One package (2 caps) is exactly what you need to replace both dust caps on a single axle. For tandem-axle rigs, order two packages to service all four hubs at once.
No special tools are required beyond a rubber mallet or a block of wood to tap the cap squarely into the bore. The correct procedure:
The 2.72-inch bore is the most common size on Lippert 7,000-8,000 lb axles, but Lippert also produces hubs in other bore sizes (such as 1.986" and 2.44"). Measure your existing cap OD or the hub bore ID with a caliper before ordering. Do not assume based on axle weight rating alone -- bore size must match.
Inspect dust caps every 3,000-5,000 miles or annually, whichever comes first. A missing rubber plug, cracked cap rim, or cap that moves by hand are all signs it is time for replacement. Always re-grease bearings whenever a cap is removed or disturbed.
This cap fits Lippert-manufactured trailer axles and hubs with a 2.72-inch hub bore diameter paired with the Super Lube (Ez-Lube) grease system. Typical applications include:
This cap is not compatible with standard (non-Super-Lube) hubs that do not have a center grease fitting, nor with Lippert hubs using a different bore diameter.