Engineered specifically to protect bearings from the elements during all
trailer operations. Takes the worry out of submerging your wheel hubs during
launching and loading of boats. A unique coiled stainless steel spring combined
with a neoprene seal maintains grease under constant pressure when filled. A
built-in outlet allows surplus grease to escape if the hub is over filled or
excessive pressure occurs. Extended grease fitting indicates full or that
additional grease is needed. The integral flange allows for simple installation
and removal. Molded polycarbonate construction provides exceptional impact
resistance and eliminates corrosion caused problems.