Product review (5 stars): Check you old cartridge carefully before replacing your housing
This was an exact replacement fit for my refrigerator. After I replaced this unit I found out that this was not my problem. I placed my old filter cartridge back in and it leaked the same as before. As I looked carefully at the old cartridge in the sunlight I noticed a very fine crack at one of the ports that extended under the o-ring. The new cartridge ports looked thicker. The new replacement cartridge did not leak. The water and ice will work without a cartridge in place if you want. You just won't have filtered water and ice. When you pull your old cartridge out the housing has a bypass and seals off so no water will come out of the housing when removing the cartridge (or very little water as long as it's working properly).