PROTECT YOUR INVESTMENT - Whether it’s a boat, camper, or utility trailer, our Bearing Buddy prevents wheel bearing failure. Keeps water and dirt out of hubs and bearings. Paired with the Bearing Buddy Bra, which keeps grease out of your wheel and adds protection EASY MONITORING - The blue visual grease indicator shows when your hub is properly filled with grease. When full, it extends out the retaining ring a ⅛”; when it’s flushed under the ring, it’s time to add more grease KEEPS GREASE IN & WATER OUT - Bearing Buddy has a spring-loaded piston that keeps a steady 3 psi of pressure inside your hub to hold grease in and block out water and dust. Bearing Buddy limits the pressure to 3 psi, preventing overfilling and overpressurization. Without this feature, the inner seal will be damaged QUICK & SIMPLE INSTALLATION - Measure the inside diameter of your trailer hub or the outside diameter of the dust cap with a caliper for a precise measurement and correct fit. Then, tap the Bearing Buddy into place using a wood block and a hammer. No special tools or experience required BUILT TO LAST - Manufactured with premium carbon steel components and their internal components of stainless steel to resist corrosion and keep the hub lubricated. Genuine Bearing Buddy chrome-plated stands up to freshwater environments. Proudly made in the USA and backed by a Lifetime Warranty, giving you long-term peace of mind, Weight: 1.81 pounds, Manufacturer: Bearing Buddy