Product Details: The HFA2 Series 50 GPM Return Line Filter Assembly from Buyers Products blocks contaminants as small as 10 microns from returning to your hydraulic reservoir. This filter head is rated up to 50 GPM for return line flow and can take up to 150 PSI of working pressure, with your choice of a 15 or 25 PSI bypass. It has four gauge ports. The assembly comes with the filter head and either a 10 or 25 micron filter element. Items can also be purchased separately.