Pleatco PXG3672 DE Grid Replacement Filter leviton An adapter like this is An adapter like this is useful because it helps connect the heater to the indoor vent system in a more appropriate and organized way The FC 3433 reference gives this part practical value because replacement cartridges work best when the new element matches the intended housing and operating application closely DE grids are useful because the filter assembly depends on them to support the media layer that traps fine debris during circulation This part has practical value because replacing the right grid can bring a worn or damaged DE system back into service without replacing the full tank or manifold assembly