American Standard Colony3 1.6 gpf/6.0 Lpf 12-Inch Rough Tank - AMS-4425A004

Tank only. The Colony3 4425A004 is the china tank component, so it has to go on a matching Colony3 bowl that is already in place or ordered separately. Toilet tanks are not interchangeable across series or brands, the bolt pattern and the outlet spud location are specific to the bowl they were engineered with. If you are replacing a cracked tank on an existing Colony3 two piece, this is the right part. If you need a working toilet from scratch, you need the bowl and seat as well.

It is a 12 inch rough tank. The 12 inch measurement is from the finished wall to the center of the closet flange, and it is set by the bowl, not the tank, so what really matters is that the bowl underneath it is the 12 inch rough Colony3. Ten inch and fourteen inch rough installations use different bowls, and pairing this tank with one of those is not a mix you can make work. Twelve inch is the standard rough on the large majority of North American installations, so most replacements land here.

No. The Colony3 tank is built for the Colony3 bowl, and American Standard's other families use their own tank to bowl geometry, so a Colony3 tank on a Cadet or Champion bowl will not seal or bolt up correctly. Identify the series stamped inside the existing tank lid or on the bowl before ordering, because the outside of a two piece toilet gives you very little to go on.

1.6 gallons per flush, which is 6.0 liters. That is the federal maximum flush volume rather than a high efficiency volume, so if your project spec or a local utility rebate calls for 1.28 gpf, this is not the tank that gets you there. For straight like-for-like replacement in an existing 1.6 gpf building, it matches what is already on the wall and keeps flush performance consistent across the other fixtures.

Yes, and on a two piece Colony3 that is usually the cheaper repair. The 4425A004 ships as a tank for a 1.6 gpf, 12 inch rough Colony3, so the bowl, flange, supply stop and closet bolts all stay where they are. What you are buying is the china tank itself, so plan on reusing or replacing the tank to bowl gasket and bolt kit as part of the swap, since those are the parts that fail on reassembly.