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Product overview


Product Specs:

Product Specs

  • Product Type: Toilet Tanks
  • Finish/Color: White
  • Style: Modern/Contemporary
  • Material: Vitreous China
  • Warranty: 1 Year Limited Warranty


L 19" x W 6 5/8" x H 13 3/8"

About TOTO ST448EMNA#01 Aquia IV 19" 1.28 & 0.9 GPF Dual Flush Toilet Tank Only in Cotton White

The TOTO Aquia IV Arc Dual Flush 1.28 and 0.9 GPF Auto Flush Compatible Toilet Tank is designed for use with the Aquia IV dual flush bowl. The curved shape offers a contemporary and sleek design to complete your bathroom. Features TOTO's Dual-Max dual flush option, allowing you to proactively conserve water usage, allowing you to choose between a 0.9 GPF rinse or 1.28 GPF for tougher jobs. This version of the Aquia tank offers TOTO T40 WASHLET and Auto Flush compatibility for when you are ready to upgrade to a hands-free flush system with electronic bidet seat. The Aquia IV Cube tank meets the standards for EPA WaterSense, and California’s CEC and CALGreen requirements. The Aquia IV Arc includes a tank to bowl gasket, tank to bowl hardware, and toilet bolt caps. Additional items needed for installation and use must be purchased separately: toilet bowl, wax ring, toilet mounting bolts, water supply lines, and optional WASHLET with Auto Flush kit purchased separately. The Aquia IV tank should be used with Aquia IV bowls.
  • Vitreous china construction
  • Dual flush system allows you to proactively conserve water - Select 1.28 GPF or 0.9 GPF
  • Left hand trip lever
  • Auto flush compatible
  • Aquia IV Arc toilet tank for use with Aquia IV toilet bowl
  • Oversized: Yes
  • Included Parts: tank to bowl gasket, tank to bowl hardware, and toilet bolt caps


  • WaterSense certified
  • CALGreen
  • CEC compliant

Key Features & Innovations


A partnership program of the U.S. Environmental Protection Agency (EPA) makes it easier to save water and protect the environment by identifying high efficiency products that perform well. The WaterSense label was created to encourage manufactures to produce water efficient plumbing fixtures and to develop a system to help consumers recognize these products. that have been performance tested and validated by several agencies.

As members of the EPA’s WaterSense Steering Committee, TOTO water efficiency specialists advised the EPA on developing product performance criteria for the WaterSense program. TOTO products are recognized is part of the EPA’s National Environmental Achievement Track, the “gold standard” for facility-based environmental performance, recognizing environmental excellence by encouraging facilities with strong environmental records to go above and beyond legal requirements. TOTO is also a partner in the EPA’s innovative collaboration with the freight industry to increase energy efficiency while significantly reducing greenhouse gases and air pollution.

  • Qualify as high efficiency toilets (1.28 GPF or less)
  • Have a minimum soybean paste flush score of 350 uncased grams
  • Meet the los angeles department of water and power supplementary pricing specification regarding trim quality and tank volume
  • Have third party testing agencies conducting product performance testing and validation


Established in 1953 by the California Building Standards Law, the California Building Standards Commission (CBSC) is within the Department of General Services under the Government Operations Agency. CBSC members are appointed by the Governor and confirmed by the State Senate.

CBSC's mission is to produce sensible and usable state building standards and administrative regulations that implement or enforce those standards.

Specifically, CBSC:
  • Assists state agencies in producing high-quality amendments
  • Works to repeal unnecessary building regulations and see that ambiguous regulations are more clearly written
  • Assists various constituents and special interest groups in making their needs known to various code-writing departments
  • Administers a public appeal process
  • Educates the public about the state's building code, and helps them to understand and comply with it
  • Ensures Title 24 is published with minimal errors

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