Recovery machines are used to remove/remove refrigerant from refrigeration and air conditioning systems prior to equipment maintenance or repair.  The VA-TWIN operates through a piston starter box. This cylinder allows for more consistent performance during the recovery phase. Its starter box is completely isolated from the refrigerant flow. As a result, the durability will be greater, since the bearings are not in contact with the coolant as in the rest of the units. In addition, by having better cooling in the cylinder head, the seals and valves remain cool and have greater durability.