The bearing in a zerk fitting keeps dirt and debris out of the grease reservoir, but it can always use some help. The addition of a grease fitting cap is an inexpensive way to add another layer to keep the grease clean and protect the fitting for a longer life. The set includes 350 caps. 150 x 6mm loop size, 100 x 8mm loop size, 100 x 10mm loop size).
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