The cartridge assembly would have been great for me as I wouldn't have had to buy a new recirculating pump. Unfortunately, after years of use, there is no way to remove the old pump cartridge. Trust me, I tried multiple plumbers and nobody could get the old ones out of either of the pumps. I even called the manufacturer to make sure it was being attempted right. The use over time caused being or sticking of the cartridge and left no way for anyone to get the assembly out. It was a good idea to try and save people a lot of money and even a plumber, but chances are it will not work for most.