The Whirlpool WP9742945 Dishwasher Lower Spray Arm Retainer Nut securely fastens the lower spray arm to its mounting hub for proper water distribution. Positioned at the center base of the dishwasher tub, this replacement nut attaches to the threaded hub and keeps the spray arm correctly aligned while allowing it to rotate during wash cycles. A secure connection maintains stable spray... https://www.partsmelange.ca/whirlpool-wp9742945-lower-spray-arm-retainer-nut-for-dishwasher