LockNLube Grease Gun Coupler locks onto Zerk fittings. Grease goes in, not on the machine. World's best-selling original locking grease coupler. Rated 10,000 PSI. Long-lasting rebuildable tool.

• Won't leak once locked on
• Hands-free, does not release under pressure
• Rated up to 10,000 PSI
• 1/8 NPT thread. Works with all grease guns
• Grease goes in, not on, the machine
• Works on all Zerk fittings, SAE and metric
• Comes with free replacement seal and jaws. Fully rebuildable
• Easily releases from clogged grease fittings, even under pressure
• Patented Locking Technology. US Patent #8955544