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AUTO-FLUSH UNIT FOR 1.28GPF
Manufacturer Resources
Product Specs
- Product Group:
- Washroom/Bath Accessories
- Product Subgroup:
- Parts and Accessories
- Product Type:
- AUTO-FLUSH UNIT FOR 1.28GPF
- Parts and Accessories Type:
- Flush Valve
- Department:
- Plumbing
- Application:
- Toilet
TOTO THU857 – Frequently Asked Questions
1) What is the TOTO THU857?
The THU857 is a TOTO auto-flush unit for 1.28 GPF toilets, sold as a replacement part. It is the automatic flush mechanism itself, not a complete toilet or a tank kit, so it is what you order when the sensor flush unit on an existing 1.28 gallon TOTO fixture has failed.
2) Will the TOTO THU857 auto-flush unit work on a 1.6 GPF toilet?
No. The THU857 is specified as an auto-flush unit for 1.28 GPF, so it is matched to a 1.28 gallon per flush fixture. Flush volume on an automatic unit is set by the valve it drives, so putting it on a 1.6 GPF fixture is a mismatch. Check the flush rating stamped on your bowl or listed on the fixture before ordering.
3) I manage a building with TOTO commercial toilets and the sensors are failing one by one. Can I standardize on the THU857?
Only across your 1.28 GPF TOTO fixtures. The THU857 is a TOTO replacement auto-flush unit built for the 1.28 gallon flush rate, so any bowl in your fleet at a different flush volume needs a different unit. Facilities with a mixed run of 1.28 and 1.6 gallon bowls will end up carrying two part numbers, so it is worth walking the building and counting flush ratings first.
4) Is the TOTO THU857 a whole toilet or just the flush part?
Just the flush part. The THU857 is a replacement auto-flush unit, ordered by itself, so the bowl, tank, seat, and supply are not included. If the porcelain is fine and only the automatic flush has quit, this is the piece to replace.
5) What part number do I give my plumber for a TOTO 1.28 GPF automatic flush replacement?
THU857 is the TOTO manufacturer part number for the 1.28 GPF auto-flush unit. It ships as a single configuration, so there is no finish, voltage, or handing option to specify with the order.
How fast can I get the TOTO THU857 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the TOTO THU857 come with a warranty?
Absolutely. The TOTO THU857 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the TOTO THU857?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the TOTO THU857 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.