Grease Coupler, For Use With 5/8 in Button Head Grease Fittings, Size 5/8 in, Connection Zerk, Max. Pressure 3,000 psi, Min. Burst Pressure 3,000 psi, Working Pressure 3,000 psi, Material Steel/Zinc, 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. -