Bearing Buddies are quite different. They are spring-loaded and originally intended for boat trailers. Greasing the Bearing Buddy pressurizes the hub so water can't get past the seal.
The other system is the "E-Z Lube" axle, and is pretty common on utility trailers. The E-Z Lube axle has a passageway drilled through its center with outlets between the inner bearing and seal. Grease flows towards the dust cap, so in theory it won't be pushed out the seal. See the link below for a picture.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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