These are available in 2 versions -1 litre and 2 litres capacity. the plunger pumps are maximum 4 in number and there is no adjust ability of dose. The Cenlub Lubricator basically runs on 12v or 24v DC. A timer is given so that desired amount of grease goes to the lubrication points intermittently Normally 1 Litre pump has max. 2 outlets while 2 litres pump has max. 4 outlets.