Lumax Brand Push-Type Adapter. For use on hand-operated grease guns only. For hard-to-reach grease fittings on cars, trucks, farm equipment. Includes slide-on locking sleeve. A simple push-on motion attaches to a standard grease coupler for fast service. 3-3/4" length. Zinc-plated, corrosion-resistant finish. Recommended working pressure: 3,000 PSI (207 Bar). Maximum operating pressure: 4500 PSI (310 Bar)