personally I find these to be great
http://www.ebay.com/itm/Marpac-7-6862-Qwick-View-Filter-Assembly-Fuel-Water-Separator-Clear-10-Micron-/172305898509?hash=item281e3b5c0d:g:UjYAAOSwQYZWzmo q&vxp=mtr
they give you a full view to know how your gas flow is going, replacement fuel filter cartridges are just $10-$15, and its completely and totally rust proof since whatever isn't plastic is made of brass, except for the top, which is some sort of rust proof magnesium alloy I think.
mine has been sitting out in direct sunlight for 5 yrs and has no rust, no issues, and still looks like the day I bought it