Dutton-Lainson Company - D-L (6332) Grease Keeper Caps - Rust-Resistant Grease Keeper Wheel Bearing Protector and Steel Dust Cap with Pressure Relief Valve - 1 in. & 1-1/16 in. - Made in USA

The Dutton-Lainson (6332) Grease Keeper Wheel Bearing Protectors revolutionize trailer maintenance by transforming standard dust caps into an active bearing protection system. These zinc-plated steel protectors create a positive hub seal that shields your trailer wheel bearings from water, dirt, and road debris while maintaining optimal grease pressure inside the hub assembly. Engineered specifically for boat trailers and frequent water submersion, each protector features a built-in grease zerk fitting that allows easy lubrication without removing the wheel hub. The innovative pressure relief valve prevents over-pressurization that can damage seals, extending bearing life and reducing costly maintenance. This simple yet effective design contains no complicated moving parts or gaskets that require replacement. Installation takes seconds with just a rubber mallet - no hub removal needed. The snug-fitting design accommodates both 1" and 1-1/16" spindles, making them compatible with popular Dutton-Lainson bearing sets 6502, 6503, and 6507. Each package includes two bearing protectors and two vinyl dust covers, providing complete protection for one axle. Made in the USA with quality zinc-plated steel construction, these protectors deliver years of reliable service whether you're launching boats, hauling utility trailers, or traveling cross-country.

• PROTECTS WHEEL BEARINGS: These zinc-plated trailer bearing dust caps create a positive hub seal protecting wheel bearings from water and dirt. The grease keeper wheel bearing caps for trailers maintain clean bearing grease while preventing washout during boat launching. Each trailer hub dust cap includes a pressure relief valve that prevents over-pressurization, extending trailer wheel bearings' life and reducing maintenance on boat trailer hubs.
• EASY MAINTENANCE: Featuring a grease zerk fitting, these boat trailer bearing caps allow quick lubrication without removing the wheel hub. The design extends the time between bearing repacking, saving money on trailer parts maintenance. Unlike standard dust caps for trailer hubs, the zerk permits frequent greasing while the relief valve protects seals. No complicated moving parts or gaskets means these trailer dust caps provide reliable, maintenance-free protection.
• QUICK INSTALLATION: Install these trailer hub grease caps in seconds using just a rubber mallet - no hub removal needed. The snug-fitting steel construction replaces standard trailer bearing caps on 1" and 1-1/16" spindles, compatible with bearing kit models 6502, 6503, and 6507. Each package includes two bearing protectors and two vinyl dust covers for complete axle protection. Made in the USA, quality ensures these trailer accessories deliver lasting performance.
• MARINE-GRADE PROTECTION: Designed for boat trailer wheel bearings facing frequent water submersion, these trailer grease caps feature zinc plating for corrosion resistance. The positive hub seal minimizes water entry when launching, while maintaining proper grease pressure inside the hub. Essential boat trailer parts for saltwater use, these wheel bearing dust caps prevent premature bearing failure and dangerous wheel separation during highway travel.
• COMPLETE HUB UPGRADE: These grease keeper caps transform basic dust caps into an active bearing protection system. The built-in grease cup supplies continuous lubrication to wheel bearings while the pressure relief valve prevents seal damage. These steel protectors fit any trailer wheel hub requiring a 1" or 1-1/16" fitment. Ideal for utility trailer parts upgrades, boat trailer accessories, or any trailer kit needing superior bearing protection.