Product review (5 stars): Fixed my problem on my Kenmore HE5T Steam washer.
This did the trick when my Kenmore complained of an F20 error.

The new part was white plastic, matching the old part exactly. Best of all, it worked.

If you're considering doing the fix yourself, just search YouTube for F20 error and Whirlpool Duet. There are dozens of really helpful videos showing how to open the machine, and what other places to check for issues, like socks clogging the pump, holes in air tubes from rubbing by the tub, or clothing in the rubber door seal not allowing the unit to drain.