Works three ways: Cartridge, Pressure Pump, Suction. Air bleeder valve for quick and easy priming. Includes 6" pipe extension and heavy-duty coupler. Positive displacement head. Rugged die cast head and zinc plated components. Dual check valve allows for short stroke pumping. Bulk filler plug quickly adapts to bulk fillers. 'Twist-Lock" feature forces plunger into problem cartridges. A high performance professional grease gun is loaded with features for automotive, industrial, agricultural and marine uses. Easy three-way loading by standard 14 oz. cartridge, pressure pump and by suction up to 16 oz. No adjustments needed for bulk or cartridge use. NO extra accessories to add later.