The Flexzilla quick-release grease coupler features a patented, innovative design which enables quick and easy connections to grease fittings, even in tight spaces. The Quick-Release Grease Coupler features a spring latch for positive engagement and allows for one-handed operation. When the fitting becomes pressurized, depress the thumb lever and release the coupler. No more stuck on couplers and broken grease fittings. Plus, the Quick-Release Grease Coupler eliminates grease spurts when disconnecting, keeping your workspace clean.