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DRAIN VALVE FOR DUAL FLUSH TOI
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:
- Sink
TOTO THU739S-A – Frequently Asked Questions
1) What is the TOTO THU739S-A part?
THU739S-A is TOTO's replacement drain valve (the flush valve assembly that seals the tank and releases water into the bowl) for a dual flush toilet. It's a service part, so it's what you order when the tank runs continuously or won't hold water and the valve seal is the culprit rather than the fill valve.
2) My TOTO tank keeps running - do I need the drain valve or the fill valve?
Two different parts. THU739S-A is the drain (flush) valve, the assembly at the bottom of the tank that holds water back and dumps it on a flush. If water is trickling into the bowl continuously and the tank level never settles, that's the drain valve seal. If the tank overfills, hisses, or won't shut off at the top, that's the fill valve, and this part won't fix it.
3) Will the THU739S-A drain valve fit any TOTO toilet?
No. THU739S-A is built for TOTO dual flush tanks, not single flush models. TOTO drain valves are matched to the specific tank casting and the dual flush actuator, so a single flush toilet takes a different service part. Match your tank model to the valve TOTO lists for it before ordering.
4) How do I order the right TOTO dual flush drain valve for a building full of toilets?
Order by the TOTO service part number, THU739S-A, not by the toilet's name. TOTO tanks carry a model number stamped or printed inside the tank near the water line, and the drain valve is keyed to that tank. For a property with mixed vintages, pull the tank numbers first, then match part numbers, so you're not stocking one valve that fits half the fleet.
5) Is THU739S-A a whole valve assembly or just the rubber seal?
It's the drain valve itself, the complete valve unit for a TOTO dual flush tank rather than a loose gasket. If a previous repair only replaced the seal and the leak came back, replacing the valve assembly is the next step.
6) Do I need to shut off water and drain the tank to replace a TOTO dual flush drain valve?
Yes. The drain valve sits through the bottom of the tank, so the supply gets shut off, the tank flushed and sponged dry, and on most TOTO two-piece tanks the tank comes off the bowl to reach the valve nut and tank-to-bowl gasket. Plan on replacing the tank-to-bowl hardware and gasket at the same time if it's an older toilet, since those seals rarely reseat well once disturbed.
How fast can I get the TOTO THU739S-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 THU739S-A come with a warranty?
Absolutely. The TOTO THU739S-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 THU739S-A?
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
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