a cartridge top load filter design and filter element useable with the filter are described that allows fluid to be drained from the filter housing , from the exterior of the housing and without first removing the filter element or the housing cover . the draining feature can be manually activated by a knob that is accessible from the exterior of the filter housing adjacent to the removable cover . the draining feature does not require any tools to activate , and provides a “ clean service ” option of draining fluid before opening the filter housing .