Ximoon Dexter Vortex Replacement Threaded Dust Caps 2-Pack — 2 5/16" O-Ring Seal for 1250–1750 lb Hubs

Ximoon 81143 replacement threaded dust caps are a direct-fit 2-pack designed to seal Dexter Vortex and similar 1250–1750 lb trailer hubs, keeping bearings protected from water and debris.

These Ximoon 81143 caps replace common Dexter Vortex covers (48355V, K71-G01-73, 21-261 and compatible hub kits) using a threaded design and a snug O-ring seal. Made from durable materials and sized with an outer thread diameter of 2 5/16", they install quickly and give a secure, contaminant-resistant closure for boat trailers, utility trailers, and small-axle applications.

How do Ximoon 81143 caps fit my Dexter Vortex-style hub?

The caps are engineered to match the thread pattern and dimensions used on many Dexter Vortex hubs and equivalent kits. They work with 1250–1750 lb axle ratings and common part numbers listed by hub manufacturers, providing the same fitment as original equipment covers.

• Compatible with Dexter Vortex references: 48355V, K71-G01-73, 21-261.
• Outer thread diameter: 2 5/16" for direct replacement.
• Intended for 1250–1750 lb rating hubs and tie-down engineering vortex hubs.
• Sold as a 2-pack so you get both sides of an axle.

What materials and sealing features protect bearings?

These threaded caps are molded from tough materials that resist road salt, UV exposure and general wear. An integrated O-ring seals the hub bore to keep water, sand and grit away from the bearings and grease, helping to extend component life when used and maintained properly.

• Durable construction resists cracking and corrosion.
• O-ring provides a tight, contaminant-free fit.
• Threaded design locks securely in place under vibration.
• Easy to inspect and service without special tools.

How simple is installation and maintenance?

Installation is straightforward: screw the cap onto the hub threads and seat the O-ring. Most users complete installation in minutes using hand pressure and a light wrench if needed; removal is just as quick for greasing and inspection.

• Threaded cap for tool-free hand tightening and easy removal.
• Two caps included — one per wheel on a single axle.
• Routine bearing checks remain simple with removable cover.
• Works with standard hub grease and bearing maintenance practices.

Will these caps work on boats and trailers near saltwater?

The materials and O-ring design offer good resistance to moisture and contaminants, making these caps suitable for marine and freshwater trailer use. Regular rinsing and post-use maintenance in saltwater environments will help prevent long-term corrosion on surrounding hub components.

• Suitable for boat trailers when rinsed after saltwater exposure.
• O-ring reduces water intrusion during short-term immersion or spray.
• Durable finish helps resist road and marine conditions.
• Swap and inspect caps during seasonal maintenance for best results.

Who is this for: Ximoon 81143 replacement caps are aimed at trailer owners, boaters and fleet managers who need an affordable, OEM-compatible solution for 1250–1750 lb hubs built to Dexter Vortex specifications. If you need a fast, reliable replacement that installs in minutes and protects bearings from contamination, this two-piece threaded cap set gives a practical, service-friendly option for routine trailer upkeep.