Quicksilver 816296Q03 In-Line Fuel Filter Element - Mercury and Mariner Outboards In-Line fuel filter removes damaging or performance robbing fuel Born contaminants Produced to Meet Mercury marine original equipment Manufacturer specifications to best protect your outboard Fits in-line the 1/4 inch fuel line under the cowl of your Mercury or Mariner outboard Has 1/4 inch Barb fittings on each end and is easy to replace using common tools and existing hose clamps