Workforce Grease Coupler, 4-Jaw, Check Ball - L2010 EXTREMELY DURABLE - The precision fit jaws are hardened for long term use EXPERT DESIGN - 4 Jaws for better grip and longer service life 6,000 POUNDS PER SQUARE INCH - Maximum working pressure FOR THE PROFESSIONAL - Use on professional jobsites, in automotive shops or at home in the garage COMPATABILITY - 1/8 (inch) ends. Compatible with Lube-Link accessories