SyunsXoon Dexter Vortex replacement caps 2-pack (81143/48355v) — threaded with O-ring seal

If a worn or missing dust cap is letting grease escape or grit enter your trailer wheel hub, these SyunsXoon replacement caps offer a straightforward fix. Designed for Dexter Vortex-style hubs, the set includes two threaded 81143/48355v caps made from resilient hard plastic with integrated O-ring sealing. They’re sized for common 5-bolt Vortex hub kits found on many small boat trailers, utility trailers, and light-duty hauling setups.

Which hubs and trailer weights will these replacement caps fit?

These caps are built for Dexter Vortex hub assemblies that accept the 81143 / 48355v style threaded cap. They fit standard Vortex hubs rated roughly between 1250 and 1750 pounds and are intended for 5-bolt hubs only — not 6-lug models.

• Compatible part numbers: 81143, 48355v, K71-G01-73, 21-261
• Outer thread diameter: approximately 2 5/16"
• Fits most Dexter marine and light-duty trailer Vortex hubs
• Not compatible with 6-lug hubs or non-Vortex threaded systems

How do these caps install and seal to prevent leaks?

Each cap uses a threaded design that screws into the hub bore for a secure mechanical fit, and a molded O-ring sits in place to reduce grease seepage. Installation is simple with standard hand tools; no special presses or adhesives are required.

• Thread-in removal and installation — hand or wrench-tighten
• Molded O-ring provides a grease-resistant seal
• Hard plastic resists cracking under normal trailer service
• Sold as a 2-pack so you can replace both sides at once

What materials and durability can I expect from these replacement caps?

SyunsXoon caps are molded from a tough, high-density plastic engineered to resist impact and deformation during routine trailering and storage. While not metal, the material balances strength with corrosion resistance so it won’t rust like steel caps located near marine environments.

• Hard plastic construction — impact-resistant and lightweight
• Corrosion-resistant for marine and road use
• Designed to hold shape under normal hub loading conditions
• Replaces brittle or missing caps that allow contamination

Who is this for: This 2-pack of SyunsXoon 81143/48355v replacement caps is aimed at trailer owners, boaters, and repair shops needing an economical, reliable way to reseal Dexter Vortex 5-bolt hubs. Choose these caps when you have a compatible Vortex hub (check thread diameter and bolt pattern), want a corrosion-resistant alternative to metal caps, and prefer an easy threaded installation that restores proper grease containment. If you’re unsure about fit, confirm your hub’s part number or measure the thread diameter before buying.