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Grease Fitting Caps
Grease fittings, greaseĀ nipples, or Zerks, are threaded metal connectors that are permananently installed in bearings. Grease fittings feature a nipple that contains a small captive ball held that is held in place by an internal retaining spring. When moderate to high pressure is applied, the ball functions like a valve that opens to allow lubricating grease to flow through a channel into the voids of a bearing. The ball acts as a check valve to keep grease from escaping.

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