A direct-fit replacement hub cap that threads securely into oil bath hubs rated 10,000 to 16,000 lbs. The clear polycarbonate construction lets you check oil level at a glance -- no removal required -- while the included O-ring and plug deliver a positive, leak-free seal that beats traditional press-fit caps.
Press-fit oil caps work their way loose over miles of highway vibration. The Lippert 693935 threads in and torques down to 20-30 lb-ft, eliminating the risk of a cap backing off and spilling hub oil on your brakes or tires. The transparent polycarbonate dome gives you an instant visual check of the oil level from outside the wheel -- a real advantage during pre-trip walkarounds or roadside stops.
This cap is built for heavy-duty trailer hubs -- the kind found on large fifth wheels, goosenecks, horse trailers, and toy haulers running 10,000 to 16,000 lb axles. Everything needed for installation arrives in the box: the cap, a sealing O-ring, and a center plug.
Transparent dome lets you verify oil level without removing the cap -- quick and clean on any pre-trip inspection.
Threaded design torques to 20-30 lb-ft for a vibration-resistant fit that won't pop loose at highway speed.
Comes with the O-ring and center plug -- no hunting for extra hardware before you can button up the hub.
Sized for 10,000 to 16,000 lb oil bath hubs -- the heavy axle range common on large RV trailers and horse trailers.
Oil bath hubs depend on a proper seal to keep the lubricating oil in and road contamination out. A cracked, missing, or loose hub cap can allow oil to leak onto the brake drum, reducing braking effectiveness and creating a fire hazard. It also exposes the hub bearings to water, dirt, and road grime -- accelerating wear on expensive bearing assemblies.
If your current cap is press-fit and has ever popped off, or shows cracks in the window, the Lippert 693935 screw-in design is a meaningful upgrade. The threaded interface distributes clamping force evenly around the hub opening and stays put under load and vibration.