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How do I determine the date of manufacture of my existing toilet?
Remove the lid from the top of the tank. Look closely just above the water line for the toilet’s manufacture date or look on the lid. You may need to use a flashlight. The date may be an ink stamp, or imprint or etching in the wall. If there is no clear date stamp, take a photo of the numbers and letters that are stamped inside the tank and lid, and take a photo of the entire toilet. Toilets manufactured in 1994 or later usually have an ink stamp stating “1.6 gpf” on the toilet bowl.
