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TOTO THU740S-A Drain Valve for Dual Flush Toilet
The TOTO THU740S-A is a replacement drain valve designed for TOTO dual-flush toilets. This OEM part restores proper flush function when the original valve fails or wears, keeping the toilet's dual-flush mechanism operating as intended.
Part Details
- Brand: TOTO
- Part Number: THU740S-A
- Function: Drain valve for dual-flush toilet
- Part Type: Drain Assembly
Compatibility
Verify compatibility with your specific TOTO toilet model before ordering. Refer to your toilet's documentation or TOTO's parts lookup to confirm THU740S-A is the correct drain valve for your unit.
Manufacturer Resources
Product Specs
- Product Group:
- Washroom/Bath Accessories
- Product Subgroup:
- Parts and Accessories
- Product Type:
- drain valve dual
- Parts and Accessories Type:
- Drain Assembly
- Department:
- Plumbing
- Application:
- Toilet
TOTO THU740S-A – Frequently Asked Questions
1) What is the TOTO THU740S-A drain valve used for?
The THU740S-A is a replacement drain valve (flush valve) for TOTO dual flush toilets. It is the tank-side part that releases water into the bowl, so it is what you order when a dual flush TOTO tank runs continuously, flushes weakly, or will not hold water between flushes. It is sold as a service part, not as a complete tank kit.
2) I have a TOTO dual flush toilet that keeps running. Is the drain valve the part I need?
A tank that runs constantly is most often the drain valve seal failing to seat, and the THU740S-A is the TOTO replacement drain valve for dual flush models. If the water level instead rises past the overflow and drains away, the fill valve is the culprit rather than the drain valve. For a maintenance crew servicing several dual flush TOTO fixtures, the drain valve is the usual wear part.
3) Will the THU740S-A drain valve fit any TOTO toilet, or only dual flush models?
Dual flush only. The THU740S-A is specified for TOTO dual flush tanks, where the valve has to deliver two different flush volumes. A single flush TOTO tank uses a different drain valve, so match the part to your model number before ordering rather than assuming one TOTO valve covers the line.
4) Is TOTO THU740S-A a genuine TOTO part number?
THU740S-A is the TOTO manufacturer part number for the dual flush drain valve, and it is the number to quote when ordering or cross-referencing against a tank's parts breakdown. TOTO trim and repair parts carry the THU prefix, so a spec sheet or plumber's callout listing THU740S-A is referring to this same valve.
5) Does the TOTO THU740S-A come with the fill valve or a full tank rebuild kit?
It is the drain valve on its own. If you are rebuilding a tank completely you will also need the fill valve and any tank-to-bowl gaskets and bolts for your specific model, ordered separately by their own TOTO part numbers.
How fast can I get the TOTO THU740S-A 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 THU740S-A come with a warranty?
Absolutely. The TOTO THU740S-A 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 THU740S-A?
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product
selection,
installation tips, and troubleshooting. Contact Us
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