Fits my Delta 17T series perfectly. The only thing I could find at Delta was the entire shower cartridge assembly for over $175, so I dared to buy it for less than $50. As another reviewer said, the painting looked exactly like mine except it was plastic instead of brass. Don't be afraid of the brand name difference if you only want the cartridge. Mine was clogged with mineral deposits and water pressure is now back to normal. After removing the cartridge I turned on the water and a few bits of dirt came out which may have been part of the problem as well. The shower valve I have is marked "17T/18T Series" on the main cap and the brand is Delta.
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