Are Trailer Axle Grease Caps Waterproof

Question:

Would this style help keep water out? I have the rubber plug ones now and find water easily gets in when submerged boat trailer I dont mind prying it on and off to add grease. I just want to keep water out as much as possible. Any other suggestions welcome for EZ lube style spindles. Thanks!

asked by: Ben

Expert Reply:

A grease cap like # RG04-020 is primarily intended to keep grease inside your hub bore and keep contaminants like dirt out. They are not totally water-proof by any means but they certainly do provide a degree of water-resistance. Mostly what keeps water out of your hubs is the full level of grease inside them. That is why folks like EZ-Lube spindles since they make it so much easier to ensure your hubs' grease level is always full.

expert reply by: Adam R