"Great for boat trailers and others! Spring-loaded piston constantly packs grease into wheel bearings. Two O-ring seals and a durable one-piece housing keep the wheel bearing free of dirt and moisture, even when submerged in lake water. Red Eye shows system is grease-filled helps prevent overfilling. Guaranteed not to leak grease! Fits 1.98in. hubs. U.S.A. Diameter (in.): 1.98, Application: Boat trailers, Max. PSI: 1.98"
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