These are refurbished replacement cartridges for the old THM 1 and 2 cartridges that I have been using for several years. They're about 2.5 inches longer than the THM models, so you "may" have to raise your head a bit higher if yours is set too low. Very easy to do, just two screws. They seem to perform just as well, if not slightly better than the THM models they replace. I get really good flow rates with them. Pro tip: When removing the old cartridge, make sure you twist it fully counter-clockwise, pull straight down, and set it on the floor in the exact position. You can then use the "nub" on the side as a guide to align the new cartridge correctly (the notch should match the label on the main unit) and it will go into the cartridge with a hard "nub" facing up head pressed. Also, it might appear like he's a complete screwup when he really isn't. Be sure to wiggle it a bit by twisting it clockwise to make sure it's fully seated clockwise. So far I've never had a leak, but they can happen. If so, it's 99% sure it's just one of the o-rings. Remove the o-rings from the old one, put them on the new ones and you'll be fine.
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