You have two fuel filters. One is the 'primary' filter which is a fuel/water separator filter. The gizmos on the bottom of that filter are 1) a petcock you open to check for water/drain water and 2) a sensor that detects water in the fuel and provides an alert on the dash.
Your other filter (the one without the fittings on the bottom) is your secondary, 2 micron filter. So the primary gets the big stuff and the secondary filters down to 2 microns so that traps most anything else.
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2007 Country Coach Allure Siskiyou Summit, sold/traded Nov. 2018.
2019 Grand Designs 384GK-R 5th wheel. Glen Allen, VA
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