American Standard H2Optimum 1.1 gpf/4.2 Lpf 12-Inch Rough Tank - AMS-4133A114

Tank only. The H2Optimum 4133A114 is a rough tank in vitreous china, supplied with a chrome finish trip lever. You still need a matching bowl and a seat to build a working toilet, plus a supply line and closet bolts on install. Buyers replacing a cracked tank on an existing H2Optimum installation are the usual case here.

The H2Optimum tank is MaP PREMIUM listed, which is the independent flush performance rating for bulk waste removal. That listing is what separates a low-consumption tank that clears the bowl from one that gets flushed twice, and it is the number to point at when a facilities buyer questions dropping from 1.6 gpf to 1.1.

American Standard classifies the H2Optimum 4133A114 as a residential fixture. It suits multi-family units, apartments, and hotel guest rooms where the fixture is a tank type toilet. For high traffic public restrooms, contractors generally spec a flushometer bowl with a flush valve instead of a tank type unit, since there is no tank refill cycle to wait on.

1.1 gallons per flush, 4.2 litres. That puts it in ultra high efficiency territory, well under the 1.6 gpf that older tanks use, and it meets EPA WaterSense criteria. For a property manager swapping tanks across a building, the water saving per fixture is roughly half a gallon a flush against a 1.6 gpf unit.

White is the only finish this tank is built in, and the manufacturer part number is 4133A114.020. The .020 suffix is American Standard's white code. Quote that number to match a tank to an existing H2Optimum bowl.

A chrome finish trip lever ships with the tank. If your other openings are on a brushed nickel or polished brass trim package, plan on swapping the lever, since chrome is what comes in the box.