The 3 Line Filtration Kit from Buyers Products includes everything needed to set up a 3 line installation with return line filtration, including a 25 micron filter. Having a third line -- a dedicated return hose -- in your dump pump hydraulic system gives you more efficient operation from faster cycle times. Adding a return line filter keeps fluid free from contaminants and extends the life of your system components. The 3 line installation will handle flows up to 50 GPM.