Product review (5 stars): Different impeller design but DOES WORK for Whirlpool Duet washer
Saved a ton of money by replacing this pump myself.  Although the item is listed for another make/model it DOES swap directly into a Whirlpool Duet washing machine.  As other reviews have mentioned, this pump has 3 impeller blades instead of four on the Whirlpool pump but is rated for almost the exact same flow.  We were getting a 'SUDS' error and after removing the bottom panel to check for clogs in the drain, I realized the impeller shaft had sheared off inside the motor and was just spinning free.  Obviously hard for a pump to pump without being connected to anything!

INSTALL TIPS: Always a good idea to wet any O-ring before installation so it doesn't bind or tear (there was an extra O-ring in my packaging) However there were no screws included so I'd recommend saving the three original screws that attach the motor to the pump assembly.  Wipe the surfaces down so they are clean and no need to over-tighten the screws since the O-ring is designed to make a good seal.