Product review (5 stars): Easy fix for dishwasher
Spray arm nut is an easy fix for dishwasher. Check it if you see some soapy deposit on (especially plastic) dishes or if the quality of wash/rinse is inadequate.
Unscrew from the lower spray arm and check for cracks. Item is cheap and require no tools or expertize.
The item 9742945 also fits many Kenmore dishwashers. On OEM part the catalog number is imprinted.
Aftermarket nut works as well.