Marine Boat UNI Inline Fuel Filter 1/4", 5/16", 3/8" Fittings Clear Glass in/Out This is a Universal In-line Fuel Filter for 1/4", 3/8" and 5/16" fittings/ diameter lines. The clear glass allows for visual inspection so that it prevents dirt sediment from storing in the replaceable white mesh element. It uses the 260 micro filter element. This glass fuel filter fits most boats, cars, trucks, RVs, and many more. The IN and OUT signs are labeled on the housing. This set of fuel filter kit comes with multi-fit adaptors/fittings that are made in plastic nylons. The 3 pairs of fittings are 1/4", 5/16", and 3/8" fittings for correspondence fuel hose sizes. Dimension of fuel filter: 1-1/8" Diameter (1" for the glass), 3-1/2" (L). We also carry various universal fuel line at different hose barb sizes. Feel free to consult us to get the detailed information on these products!