Product review (3 stars): IS a good replacement if your pump is dead
Still F21 error.  IS a good replacement if your pump is dead.  Not a good solution to the F21 error.  Pain to install, needed a lot of silicone grease to keep the seal in place during (push and twist) installation.  I strongly suggest removing the whole (pump/filter) housing and replace the pump on a table.  You will need to see inspect all around the locking mechanism to confirm the rubber seal has not crept out.  I kept getting intermittent F21 for a year after, eventually bought a different pump&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Whirlpool-W10730972-Water-Pump-for-Washer/dp/B005AR76M8/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Whirlpool W10730972 Water Pump for Washer</a>&nbsp;which overloaded my drain, which pointed to a partial clog after the J pipe.
This pump was not powerful enough to overwhelm the partially clogged drain.  If it had, I wouldn't have kept troubleshooting other parts (Sensor, hoses, etc).