Standard 1/4" Fuel Filters limit restriction and filter fuel to keep your small engine running flawlessly! As a rule of thumb, most clear filters should only fill half way during normal operation. If you notice that the filter is almost completely full of fuel, this is an indication that it is clogged and is attempting to draw fuel through the entire cartridge. You should replace the filter as soon as you notice this. Specs: -1/4" Female port X 1/4" Female port -Dims 2.5" x 3" Replacement Items: -Replacement 1300 Micron Filter Cartridge - Part #41.0041