I just added a 3rd function valve for the claw I have on my bucket (works awesome) also added a 2 port hydraulic spool valve for a top and tilt link for 3 point hitch and also have a backhoe. All works fine. Question is, on the new spool valve I noticed a N port, should this be piped to the tank? I have seen videos with they adding a tee to tie into tank line?What is the N port used for? Should I be using this port? Thank You. Michael