The FBO filter assembly from Parker Hannifin's Racor Division is designed to clean and dry diesel fuel before it enters the vehicle tank. The FBO unit is available with a pre-filter element, a filter/separator element or water-absorbing element. Micron ratings of 1, 5, 10 and 25 are available. Flow rates for the 10-inch filter element vary from 18 to 20 gpm, and from 25 to 30 gpm for the 14-inch element.