The LeLuv eGrip Handheld Electric Vacuum Pump Handle is compatible with all LeLuv and Eyro hoses, cylinders, parts and pump accessories. It's battery-operated with 3 "AA" batteries for plenty of power at the push of a button! Easy to use with just one hand. To release vacuum, just push the button located ergonomically on the side. Among it's many uses are testing vacuum related systems in the engine including the ignition system, carburetors, automatic transmissions, computer systems, fuel system, air conditioning units, cruise control units, and emissions control system. One person can quickly and easily bleed the hydraulic lines without the mess.