The HFA0 Series 7 GPM Return Line Filter from Buyers Products blocks contaminants as small as 10 microns from returning to your hydraulic reservoir. This no-bypass filter is rated up to 7 GPM for return line flow and can take up to 200 PSI of working pressure. It has a 3/4 in., 16-threaded neck. Choose either an NPTF or SAE port version. Both use a 10 micron filter element.