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