Product review (1 stars): AVOID THIS PRODUCT FROM THIS VENDOR.
It is possible this part is a counterfeit.  The product entry has a number of fields which states "Please report counterfeits to Amazon" which may mean this vendor has a history of this sort of thing. The vendor is PartsForLess.

The gasket itself looks OK but upon installation into my Whirlpool DU1100XTPQB dishwasher it was clear that the gasket won't go all the way in.  I bought a replacement gasket for this dishwasher 3 years ago and all I did this time was to repeat my order and I don't remember having to go through 1% of the trouble I went through this time.

I had to use a pair of crimpers to push the gasket in all the way around.  STILL wouldn't go all the way in and I didn't use a tool the last time.

This one didn't come with instructions (which came with the previous one) so that might be a sign of a counterfeit product.

Also the strike plate that came with this doesn't work well.  Closing the dishwasher door with NO GASKET, the door didn't lock until I pushed really hard.  Clearly not made with the same dimensions as the original.

There is another gasket on Amazon for about twice the price.  It has instructions.  That one looks real.

AVOID THIS PRODUCT FROM THIS VENDOR.