blue, i have 2 trailers with the "accu-lube" system. basically a zerk fitting on the end of the spindle with a passage way to the back of the spindle that delivers the grease between the inner bearing & rear seal. they work great. both trailers over 10 years old and no problems. once a year i pump a fresh tube of grease in. i change colors of grease so i know when the old is out and the new is in.
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