Prevent damage caused by over-lubrication—these fittings automatically stop grease flow when pressure is within the shut-off range. They resume flow when the pressure drops below the range. An integral check valve prevents grease from leaking when pressure causes backward flow. The valve stays closed when not in use to keep out dirt and other contaminants. These fittings are also known as hydraulic grease fittings. They have PTF (Dryseal) threads, which are compatible with NPT threads.

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