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TOTO Auto-Flush Kit THU857 for Washlet S7A/S7 - Single Flush Toilets

by TOTO
SKU THU857
$129.99

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Premier Bidets BBB Business Review

The New Auto-Flush Kit For Compatible TOTO Toilets

The TOTO Auto Flush Kit is an easy to install upgrade for compatible WASHLET+ T40 toilets.

This model is designed to work with single flush 1.28 and 1.6 GPF WASHLET+ T40 toilets only.

When paired with the corresponding WASHLET+ toilet and Auto-Flush compatible S7A WASHLET, the Auto Flush kit provides a hands-free automatic flush after every use. No need to touch buttons or handles, and never worry about someone forgetting to flush.

THU857 Auto-Flush Kit Compatibility

  • New auto-flush kit for the Washlet S7A and S7 bidet seats.
  • Only compatible with single-flush 1.28 and 1.6 GPF TOTO T40 toilets.
  • Not compatible with TOTO S550e or S500e Washlets.
  • Not compatible with round S7A models (SW4735#01)

* Not compatible with TOTO Supreme II CST634CEFGT40

Customer Reviews

Based on 7 reviews
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(6)
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14%
(1)
R
Russell Snook
Very good experience

Had a small problem with one item but was replaced quickly. Items arrived quickly, well-packaged. Price very good. No complaints!

Thank you for your positive review, Russell! We are glad to hear that you had a good experiencethe TOTO Autoflush Kit. Thank you for choosing Premier Bidets!

T
TAJ
Auto-Flush Kit works great! (just watch out if you have a touchless soap dispenser)

We installed the THU857 ourselves—it was very easy and works great. We disabled the auto-flush feature (via a button on the back of the remote) because we prefer to flush manually using the new button included with the kit to add to the remote control. This beats using the toilet lever. That said, the default setting is auto-flush if that’s what you want so it flushes when you get up off the seat and no button presses needed. And you can customize the delay to certain times to flush after you get up.

One minor issue: the instructions mention connecting the water feed hose to either a white or black port on the new 857 based on hose length, but there’s only a single black port. We just used that, and everything works fine.

A heads-up: the Toto S7 remote triggered our Simplehuman touch-free soap dispenser — likely due to overlapping infrared frequencies—causing soap to squirt unexpectedly. We replaced it with the Umbra Otto Automatic Touchless soap dispenser, which isn’t quite as sleek but doesn’t react to the remote.

Premier Bidets was excellent—low prices, fast shipping, and great customer service. They confirmed compatibility, answered questions about the auto-flush settings, and made sure we had what we needed. Highly recommend and would buy from them again.

Hey there, Taj. Thank you so much for taking the time to share your experience with the TOTO Auto-Flush Kit! It's wonderful to hear that you had a positive experience with our customer service team. Thank you for choosing Premier Bidets, we hope to see you again soon!

J
JOEL RODRIGUEZ
Toto Auto Flush

I wrote on March 5, 2025, that the flush button attached to the remote control didn't arrive in the box. To this day, I haven't received a solution. Without the flush button, I can't use the purchased equipment. Mr. Valdez told me they had written to Toto, but I didn't make the purchase from Toto, but from Bidets Premier.

Thank you for bringing this to our attention. We sincerely apologize for the inconvenience regarding the missing flush button for your TOTO Auto-Flush Kit. As we’ve been in contact with you via email, we want to assure you that we’ve already reached out to TOTO on your behalf and are actively working on a resolution. We appreciate your patience and understanding.

E
Eliezer Torrez
Outstanding Service & Lightning-Fast Shipping – A 5-Star Experience!

I couldn’t be happier with my experience shopping at PremierBidets.com! From start to finish, they exceeded my expectations. The **shipping was incredibly fast**, and I received my order much sooner than anticipated.

What really stood out was their **responsive and friendly customer service**—every question I had was answered promptly and professionally. It’s rare to find a company that truly prioritizes its customers, and Premier Bidets delivers on that promise.

Additionally, their **return process was hassle-free**, making me feel confident about my purchase. Their **competitive pricing** is the cherry on top—great value without compromising on quality!

If you're looking for a seamless shopping experience, look no further. I highly recommend PremierBidets.com and will definitely be a returning customer.

⭐️⭐️⭐️⭐️⭐️

Thank you so much for your kind words and 5-star review for the TOTO AutoFlush Kit! Your recommendation means a lot to us, and we look forward to serving you again in the future. Thank you for choosing Premier Bidets!

G
Greg

Great auto flusher. Doesn’t it look nice

Best Price

We'll Beat Any Price Online

Easy Returns

30 Days From Delivery

Call Us Today!

+1 (707) 297-3991

Free shipping

Anywhere in the Lower 48 on Every Order

toto auto flush kit thu857 up close

TOTO Auto-Flush Kit THU857 for Washlet S7A/S7 - Single Flush Toilets

$129.99