This is the REGULAR SIZE version of the stardard ZERK ZAPPER tool.This tool holds twice the fluid volume of our regular size ZERK ZAPPER.It is recommended for large construction equipment, bull dozers, front loaders, back hoes, or for use in service shops.This is the only tool of this type MADE IN AMERICA by the company selling the tool!!DON’T LET A CHEAPER PRICE FOOL YOU! WE PUT THE MONEY INTO THE TOOLS, NOT THE PACKAGING OR ADVERTISING.The other tools being sold have less pressure, the pistons tend to bend, and they have a cheap Chinese coupler. Compare return policies! Don’t be fooled!The Zerk Zapper tool is a simple yet amazing tool used to clean and unclog the grease fittings on farm machinery, construction equipment and industrial machinery. Anyone who greases any kind of equipment will appreciate this tool. Instead of having to remove and replace the grease fittings and digging out the old, dried up grease behind the grease fitting, simply fill this tool with a light solvent, attach the tool to the clogged zerk, and tap the piston head with a hammer. The hydraulic action along with the increasing pressure from the tool will clean the zerk and the dried grease behind the zerk. Now it will be possible to grease your machinery. You can also use the Zerk Zapper every time you grease problem zerks to prevent them from ever clogging again. The Zerk Zapper is also useful when storing your seasonal equipment. Clean all your grease fittings with the Zerk Zapper and apply new grease before storing, and your equipment will be ready at the start of the next season. Our Zerk Zapper is superior to similar tools on the market for several reasons. First, we actually manufacture the Zerk Zapper in America in our own shop. This gives us complete control over the quality of our tools and the ability to control our costs. Other tools are either imported (made in China) or manufactured by another company. Second, the Zerk Zapper has the largest piston, which provides the most fluid and most pressure for opening the grease fittings. The tool also has a check valve which holds the pressure and provides for increasing pressure. Third, the Zerk Zapper has two O-rings on the piston which delivers more consistent and higher pressure than other tools. Fourth, the Zerk Zapper tool has a four jaw hardened steel coupler with a pressure release valve. This insures a good connection to the grease fittings and a longer life. Last, and most important, we stand behind the Zerk Zapper. If anything wears out, including the coupler and the O-rings, we replace them for free. If the tool is damaged in any way, and if you are not satisfied with the tool, we will replace it or refund your money. When considering buying a grease fitting cleaning tool, do yourself a favor and buy the best. Buy the Zerk Zapper.IF YOU ARE HAPPY WITH THE TOOL AND THE SERVICE, PLEASE LEAVE POSITIVE FEEDBACK! IF NOT, PLEASE CONTACT ME AND I WILL MAKE SURE THAT YOU ARE!