This Water-Block filter removes water from gasoline and diesel fuel. Water-absorbing polymers trap water, restricting fuel flow when it is time to replace the element. It removes microscopic particles (17 microns) of rust, sand, dirt, scale and line and is also compatible with biodiesel blends up to 20%.It is constructed with a zinc die-cast top cap with 1" NPT pipe fittings and has a see-thru bowl that allows for visual monitoring of fuel flow. | Dutton-Lainson Company Water-Block Fuel Filter