Which part of the filter assembly is removed for replacement?

The correct answer is the Bowl of the filter assembly because the bowl is the part that houses the filter element and collects the contaminants that are removed from the fluid. When it's time to replace the filter, the bowl must be removed to gain access to the filter element inside. The bowl serves as a protective casing and is typically designed for easy removal and replacement, facilitating maintenance procedures.

In the context of routine maintenance, the filter element is often the component that is actually changed out, but it is accessed by removing the bowl. This makes the bowl critical in the replacement process because without removing it, one cannot change the filter element effectively. The header assembly and diaphragm are integral to the function of the filter system but do not need to be removed for a routine filter element replacement.

Understanding the function and maintenance procedure of the filter assembly is essential for proper upkeep of the systems that rely on clean fluid operations, aligning with the mechanical knowledge required for the role.