Easy operation. Single-action hydraulic closed circuit connected to an oil tank with automatic topping up for small leakages or losses. The air entered into the pneumatic circuit ensures the functioning of the product. A sturdy spring for type RM or the dual-action for type RP ensure the return at max speed. Output oil pressure can be varied by adjusting the inlet air pressure. It can be mounted in any position, but the recovery tank must be placed upright. For trouble free operations, FRL units (filter, regulator, lubricator) with min flow of 300 NL/min. are recommended. As safety precaution, mount no-return valves before the check valve.