The Gas-Suspension Milk Stool not only allows the dairyman to sit down while milking, but also assists him in getting up when finished by the expansion of gas in the cylinder, which extends the stool leg. This is the same principle used to assist in opening the rear hatch of many vans and cars. It can hold up to 220 pounds and the height is adjustable from 12" to 17". Ask the supplier for DeLaval part #97288075.