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The Xtractor® redefines the purpose of the heavy-duty hub cap—from passive containment to active protection.

HexThread Access Cartridge on Xtractor hub cap

HexThread® Front Access Cartridge

The Xtractor is equipped with a patent-pending HexThread® front access cartridge which enables easy hub oil service and internal inspection without the need to remove the hub cap or flange gasket. This feature simplifies routine oil maintenance and supports early detection of wear, helping to prevent expensive failures.

3-stage oil filter with hub oil filtering through it

Multistage Magnetic Oil Filter

The Xtractor features a submerged, multistage magnetic filter that captures large debris and fine ferrous particles suspended in hub oil. This protects seals and bearings from pitting, scoring, corrosion, and galling. This patent-pending filtration mechanism keeps lubrication oil cleaner - reducing rolling friction and helping safeguard critical axle components from particle-induced wear.

Shop The Xtractor® Hub Cap for Heavy-Duty Trucks and Trailers

XTR-7174 Hub Cap (Replaces 4024)

XTR-8856 Hub Cap (Replaces 4009)

XTR-8058 Hub Cap (Replaces 4195)

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The XTRACTOR®

The New Definition of Wheel-End Protection

Made for Performance

Close up of hub cap with Hub Corporation words stamped on it

Ultra-Durable Materials

Precision cast and machined from premium aluminum alloy, The Xtractor delivers unmatched strength, heat resistance, heat dissipation, and sealing performance.

Clear plastic hub cap sight glass on a black pedestal against a dark background

UV-Stabilized Sight Glass

The UV-stabilized, high-heat polycarbonate sight glass delivers exceptional clarity, impact resistance, and thermal stability at any temperature.

Close-up of a blue 'X' logo on a rubber vent plug

Pressure-Balancing Plug

A high-performance, rubber plug functions as both a vent and fill port. It's designed to withstand the rigors of heavy-duty operation without cracking or leaking.

Truck with illuminated headlights in a dark diesel mechanic shop

"Oil contamination causes component wear which generates more contamination. This chain-reaction-of-wear causes higher friction, leading to higher fuel consumption, misalignment, vibration, and premature component replacement."

- SAE Review of Lubricant Contamination

Close-up of a black tire with a detailed hub cap on a heavy-duty truck.

Steer Axle Hub caps

Durable construction and active filtration to keep your truck moving.

The Xtractor® Is The Only Perormance Driving Hub Cap for Heavy-Duty

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Close-up of a truck's wheel with visible tire and rim on a road at night.

Trailer Axle Hub Caps

Advanced protection and cleaner oil to keep your trailers rolling.

FAQs

What makes The Xtractor unique?

Most hub caps are just passive covers. The Xtractor is a performance-driven component, actively filtering foreign particulates from circulating in hub oil, reducing rolling resistance and safeguarding against particle-induced wear.
What problem does it solve?

Traditional hub caps allow metal & debris to continually circulate through your wheel-end system, causing rolling friction and accelerating component wear. The Xtractor removes contaminants to stop this destructive behavior.

What vehicles is it compatible with?

The Xtractor is engineered for standard Class 7 and 8 trucks and trailers, with fitment options for most standard hub configurations.
Is it field tested and proven?

Of course. The Xtractor has been tested in real-world fleet operations and validated by experienced mechanics and logistics professionals.
Is it easy to install?

Absolutely. The Xtractor fits just like any other heavy-duty hub cap. Bolt, torque, fill.

Real-World Use

Dirty Oil Filter

XTR-8058

HexThread Cartridge

XTR-8058

XTR-8856

XTR-8856

This product is manufactured by The Hub Corporation and is not affiliated with, endorsed by, or sponsored by any other third party. Any references to third-party part numbers, trademarks, or brand names are for cross-reference and compatibility purposes only.