Product review (5 stars): Very easy to replace and solved the cleaning problem
The mid assembly spray arm in my 11 yr. old GE washer was plugged up solid. This was very easy to change. If your dishwasher was made PRIOR to 2004, you will have to replace the hub assembly with the new one that comes with the spray arm. It's an easy deal...I think that the screws are a #7 or #8 mm head on them. I was actually able to use a adjustable small crescent wrench on it and do it. If your dishwasher is not cleaning well, I recommend replacing this along with the other two spray arms and fine filter. After replacing those my dishwasher cleans MUCH better.