Bosch's Urea Filter for the Bosch 2.2 DENOX System is designed for Class 4 – 8 vehicles, an important feature of this filter is the high-capacity media that traps and holds contaminants throughout the manufacturers’ recommended change intervals. Other features include an O-ring that provides a tight seal to prevent leaks, and an exclusive Bosch equalizing element that buffers the pressure within the pump by expanding and contracting to eliminate cracking on internal components. The package comes with an extraction tool to simplify filter removal.