Did not fit my Moen 1222 cartridge. The flat surfaces on the T-handle that should stabilize the cartridge were too narrow to fit, so I had to cut down the cartridge plastic. Even worse, the inside diameter of jack nut was too small. The cartridge extracted only a few millimeters before the nut started pushing on the cartridge itself rather than the fixture. In both cases, it was very close to the right size, so I'm inclined to believe it is a manufacturing defect or a failure to account for the surface finish of the tool.