The WY & GP series return filters are installed on the top of the tank.There are magnets in the filter.So megnetic contaminants can be removed from oil.The element is made of fine fibre media with high efficiency, lower pressure drop and long life.Differencial pressure indicator will signal when the pressure drop across the element reaches 0.35Mpa and by-pass valve will automatically open at 0.4Mpa.Element is easy to be replaced from filter.