Alliance Truck Parts filters are designed to remove harmful contaminants from your engine. Like the fuel/water separators, which separate water from the fuel and remove large contaminants. These quality filters are designed with low restriction and high dirt-holding capacity, the clear collection bowl allows convenient viewing of water and contamination*. Fuel systems that perform poorly impact fuel economy via increase in repairs, downtime and maintenance. Self-venting drain eliminates any accumulation of water* (*where applicable).