FR Filters are multi-purpose carbon fiber filters that can be used on liquid fuels such as light mineral oil, petroleum distillates and #2 fuel oil, as well as compressed air and gases not corrosive to brass. Rated for pressures up to 125 PSI, the FR Filters are available for pipe train sizes of 1/4, 3/8 and 1/2 inch. Flow rates vary based on fluid viscosity.