The two piece clear with the two screens is the Crap Trap. I have one in line on my fuel can and one in line on most of my planes, should be all of my planes but sometimes I don't have the filters in stock.
I used to use the smaller two piece filters that you unscrew to clean but I have had them leak and seen them come apart.
Why have the two filters?? I have had A fuel line clog from mold flashing from inside A tank even after I cleaned it out before I installed it. I fly on A dry lake and the engines do tend to suck up grit and it finds it's way into the tank over time.
Always put some fuel in A new tank and shake it good then dump it out. You would be surprised at what comes out of them.