Product review (4 stars): Perfect Replacement for Whirlpool Dispenser Caps that fall out during washing and comit harikari on the bottom heating element.
Compared to the OEM dispenser cap that originally came with the Whirlpool Dishwasher, this replacement OEM part actually stays locked in place and does the job it was intended to do.  The original cap always fell out from day one (Whirlpool would NOT replace it - they wanted to charge twice the amount +tax of what is being offered here).  My original cap finally fell off during a wash cycle and melted itself on the bottom heating coil. For a small part, yes, it is way too expensive for a simple plastic cap.  BUT, like automotive parts, this is how the appliance aftermarket makes money.  It fits, it works, and hopefully you won't need another for 5 years.  The plastic on these caps do shrink and get loose after being exposed to years of washings, especially if you use high heat sani rinses all the time.  So you should have one of these on hand for a spare.