【Locking and Sealing】Upgraded 6-jaw design snaps and quality sealing gasket create a strong, leak-proof lock for zerk fittings that is easy to both lock and release. The unique and patented Retract Mechanism helps locate zerk fittings even in blind spots, while a 12-inch Spring Flex Hose is included for convenience. 【Quality Upgrade】Our grease gun tips are crafted with premium Zinc Coated Alloy Steel for maximum durability, with thicker springs that deliver a stronger locking force and prevent leaks even under extreme pressures of up to 10000 PSI. 【One Hand Operation】The double handle features an anti-slip design and smooth retraction mechanism that allows for ergonomic, labor-saving one-hand operation. Once the coupler locks onto the zerk fitting, it remains securely in place, freeing up both hands for efficient use of the grease gun. 【Wide Compatibility】Our grease gun coupler is compatible with all 1/8" NPT standard grease guns, mini grease guns, and small grease gun ends, as well as with all DIN and SAE grease fittings. This makes it highly versatile and well-suited for use on a variety of equipment, including excavators, bulldozers, cars, large factory equipment, tractors, harvesters, and more.