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American Standard 2004 Toilet Part Guide
There were 2 versions of the American Standard 2004.
The First Was A 3.5 Gallon Per Flush Toilet
The Second Was A 1.6 Gallon Per Flush Toilet
You may be able to see a stamp in the tank telling the 1.6 gpf
The 3.5 gallon per flush was an older toilet with a large tank of water.
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