Grease Coupler, For Use With Hand and Air Operated Grease Guns, Connection Zerk, Max. Pressure 6,000 psi, Min. Burst Pressure 6,000 psi, Working Pressure 6,000 psi, Material Steel, Features Instantly Connects Direct Onto Any 3 or 4 Jaw Grease Coupler, No Need of Threading, Save Time, Includes Grease Fitting WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer, and Di-isodecyl phthalate (DIDP), which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. -