RACOR 751000FHX30 Three-stage filter system removes nearly all the water and 100% of harmful solids in fuel. The primary stage centrifuges the fuel, which sends the large particulate matter and water droplets down to the sediment bowl. The second stage uses a coalescing ring, which causes the remaining water to form into droplets and fall into the sediment bowl while the dry fuel continues upward. The third stage is an Aquabloc filter, which removes the remaining minute grit. Built-in check valve keeps fuel from draining back into your tank. Fuel Type: Diesel Mounting Style: Bulkhead mount, cartridge element Filtering Fidelity: 2 micron, except 30 micron Model 309999 Drain Fitting: Self-venting Priming Pump: No Mounting Head: Die-cast aluminum Mounting Style: Bulkhead mount, cartridge element