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Old 06-18-2007
Goodnewsboy Goodnewsboy is offline
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Use a waterproof grease that you can get at the auto parts store. It is commonly used in boat trailer wheel bearings.

Zerk fittings are not a good idea in this application in my opinion. They invite overpressuring the grease containment. Most manual grease guns can generate 5-10 THOUSAND pounds (psi) of pressure. Much safer to use a grease cup if you have any say in the matter. You just give the cup a turn or two a couple of times a season and the problem is taken care of.

Here's a picture of a grease cup:
Grease Cups

Here's another device that has pressure relief:
GUN-fil® LUBRICATORS : Lube Devices
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