Milwaukee 2646-21CT M18 Cordless 2-Speed Grease Gun Kit. The M18 Cordless 2-Speed Grease Gun delivers maximum pressure and unmatched versatility, also offers a 10,000 psi operating pressure. Industry leading 10,000 PSI max operating pressure. Industry leading max flow-rate of up to 10 oz. / minute. New to world precision through Pre-Set grease counter lbs. Best in class 48 in. flexible hose. Air Bleeder Valve: Priming mechanism for quick flow.