Duplex filter is designed for pushing lines in the circulation lubrication with oil system for gear units of medium and high power with the ability to work in the most severe conditions. Filter is installed on the pressure line in any position. The direction of oil flow is as indicated on the filter. The filter cartridge is made of high strength wire cloth. Periodically it is necessary to unscrew the filter cup, remove the cartridge and wash in gasoline. The cleaning period depends on the intensity of work and the level of oil cleanliness. Filter has the option of three modes so that the filter element is possible to change and wash without stopping the flow , but with redirecting the flow to another filter element. Soiling of the filter can be determined directly - visually and indirectly, using the electrical indicator.