Product review (5 stars): Great replacement for my dishwasher.
I purchased this product awhile back to replace my dishwasher upper spray arm after it all of a sudden it just started to fall off almost every dishwasher load.  The plastic piece inside the upper arm just started to wear away.  My first stop was amazon because they have everything right?  Well, almost everything, but they sure did have this replacement in stock at the time.  When I received the upper spray arm it did not come with any instructions on how to install the new one.  Fortunately, my brother used to work at Frigidaire and he helped design plastic pieces in their dishwashers.  He was in town at the time and showed me how to install it.

It is a easy as unscrewing the plastic piece holding the old one it and lining up and screwing the new one in.
You can do it without pulling out the top drawer of the dishwasher if you pull out the drawer about half way and reach your hand up and inside the dishwasher and feel for the ring like plastic piece which holds the spray arm in place.  If you just can't get your arm inside then take out the top drawer so you will have full access.

Since you are thinking about buying this part, then you must have the same or similar dishwasher as I do.  Another tip my brother gave me is that every so often we should clean out the drain at the center base of the dishwasher.  That is very important apparently.  Check out youtube for videos explaining on how to do this.