Product review (5 stars): It will fit RPFWE.
It will indeed replace the very expensive RPFWE filters but what you need is the bypass cartridge to get the rfid chip that has and tape it to the inside of the filter area. It'll say it's unfiltered but it will be filtered water. Also you won't get the "convenient" countdown to replace your filter but easy fix is just mark it on a calendar or use your phones calendar to remind you in six months to buy another one of these.