Good to know. That ID fuel filter is amazing.The check valve is in the pump/filter. The fitting that goes in the fuel line is just a T.
I have Adams hat and DW pumps waiting to be installed and already have an aux pump. When I run out of fuel, I’m doing rails and running my aux outlet up front. I was going to add the ID fuel filter assembly up front and plumb both feeds into it, the out of it split to some radium rails.