Lumax Brand Needle-type Adapter 4-1/4". For use on hand-operated grease guns only. Needle type coupler for flush or hard-to-reach grease fittings. Designed for use in confined places, especially, the universal joint fittings. Includes slide-on locking sleeve. A simple push-on motion quickly attaches to a standard grease coupler for quick service. Zinc-plated for maximum protection against corrosion. Recommended working pressure: 3,000 PSI (207 Bar). Maximum Operating Pressure: 4500 PSI (310 Bar)