Trailer Wheel Hub Dust Cap – Protective Bearing Cover

This trailer wheel hub cap is a small yet vital piece of equipment for any boat trailer or utility trailer. It covers the opening of the wheel hub where the bearings reside. Without a cap, the bearing assembly is exposed – during travel, moisture and road grit can infiltrate and contaminate the grease, and when submerged (such as dunking a boat trailer into water), water would directly enter the hub. With the cap in place, your bearings stay dry and clean, preserving their function and preventing damage.

The cap is made of sturdy steel with a corrosion-resistant coating (typically galvanized), which means it withstands rust even with long-term outdoor exposure or frequent drenching. Installation is straightforward: choose the correct diameter cap for your hub (this model uses a universal standard designed to fit most common hub sizes). Position it at the hub opening and gently tap it in with a rubber mallet or a wooden block until it sits flush. A properly installed cap will not dislodge during travel and will provide a reliable seal.

Usage & Recommendations:

• Universal application: Suitable for various trailer types – boat trailers, caravan/travel trailers, utility trailers, etc., as long as the cap size matches the hub bore
• For boat trailers: Absolutely crucial for boat trailers where wheels are often submerged – the cap keeps out saltwater, protecting wheel bearings from rust and failure
• Check your caps periodically – if you notice oil or grease splatter around the hub, the cap might be loose or the seal compromised; replace it with a new one if needed
• Easy replacement: If an old cap gets dented by a curb or damaged during removal, a new cap installs in minutes – a tiny cost that can prevent expensive bearing replacements
• When servicing your hubs, make sure to pack fresh grease in the bearings – the cap will keep that grease contained and prevent it from leaking out as the wheels spin