Powerbuilt 648755 Mini Pistol Grease Gun Mini Pistol Grease Gun Complete with 4 steel extension Coupler develops 3500 psi pressure Convenient one-handed operation Extension can be positioned to work at 0 degree or 90 degree Includes screw type air purge valve No-slip textured barrel finish Uses standard 3 ounce cartridges or bulk fill and includes 4 inch steel extension and coupler