Lumax Brand Grease Gun Heavy Duty, Premium . Heavy-duty, LuCast, Cast-Alloy Head with heavier and reinforced wall thickness for extra strength. Develops up to 10,000 PSI (690 Bar) and burst pressure over 17,500 PSI (1200 Bar). Handy 3-way loading - fill with standard cartridge, suction or bulk fill. Fully chrome plated finish for maximum protection against corrosion. Equipped with air bleeder valve to release trapped air. Includes filler nipple with ball check for use with grease filler pump. Tough and resilient ?reversible? follower eliminates grease bypass. Allows a superior seal for either cartridge or bulk loading applications. Deluxe, contoured lever develops more pressure with less effort. Maintains pressure and grease flow on short strokes in confined spaces for more accurate applications. Heavy-duty follower spring for consistent priming. Heavy gauge steel barrel (18 G/1.3 mm) assures durability, withstands high crush pressures. Wide band, non-slip knurling for sure-grip handling. Domed end-cap for extra strength and longer life. Slip resistant hand grip for firm grip comfort and safer operation. Outputs 5.2 oz. (150 g) of grease per 100 strokes. Four hardened jaws hydraulic coupler with ball check, non-drip cap and 6" (150 mm) extension pipe. The toughest, most rugged and productive grease gun available for professional users.