Product review (3 stars): This has a different thread from my Frigidaire dishwasher, ...
This has a different thread from my Frigidaire dishwasher, although it was supposed to be a direct replacement.  I had to remove the spray arm from the threaded piece, and reuse my old threaded piece.  The piece can be removed (if you're careful), and snapped on the old threaded part.  The clip looks more secure than my came with, when purchased in 2006.  I have now used it @ a dozen times, with no problems.