Search  for anything...
American Standard

American Standard Toilet Tank Seal, Champion Flush Valve Gasket Replacement

Based on 441 reviews
Condition: New
Checking for the best price...
$18.85
Save $1.13 was $19.98

Buy Now, Pay Later

As low as $4 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Nov 9 – Nov 14
Order within 23 hours and 16 minutes

Available payment plans shown during checkout

Protect Your Purchase

Easy claims online, fast replacements, no fees

Checking for protection plans...

Recently Viewed

At a glance

Condition
New
Model
738659-0070A
Dimensions
10.05 x 5.45 x 4.7 in
Weight
15.2 oz
Exterior Finish
Brass
Vehicle Service Type
Car, Truck, Motorcycle
Fuel Type
Gasoline
In the box
Product Only

Features 5

  • BUILT-TO-LAST: This toilet tank seal is engineered to withstand daily use in residential and commercial bathrooms
  • EASY TO INSTALL: This toilet tank seal is easy to install for plumbers, contractors, or DIY homeowners
  • COMPATIBILITY: Compatible with Champion toilet flush valves
  • Genuine American Standard toilet parts

Description

The American Standard 738659‑0070A Tank Seal is designed for plumbers and contractors looking to maintain the performance of the American Standard Champion toilets. This seal ensures a watertight connection between toilet tank and bowl when paired with compatible Champion toilet flush valves. Engineered for durability and reliability, it helps avoid leaks and the issues that arise with compromised tank seals. Compatible with Champion toilets, this tank seal gives peace of mind and supports long‑term operation in busy bathrooms. From the Manufacturer Durable, reliable, quality engineering and construction. American Standard products are designed for your busy lifestyle. Parts, hardware, and components are engineered to enhance the usage of your American Standard products. About American Standard Brands Great performance and great looks meet in our complete line of fixtures and faucets for bath and kitchen. Performance and reliability. Coordinated collections. Ingenious features. American Standard is Style that Works Better everyday.

Specs 25

Brand American Standard
Material High Density Polyethylene (HDPE), Stainless Steel
Item dimensions L x W x H 10.05 x 5.45 x 4.7 inches
Exterior Finish Brass
Vehicle Service Type Car, Truck, Motorcycle
Brand Name American Standard
Manufacturer Part Number 738659-0070A
OEM Equivalent Part Number 738659-0070A

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Nov 9 – Nov 14

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

ALmost perfect replacement
I say almost, because I'm replacing one for the other right? This is what was installed and the old one's flap thing started leaking in the center so I thought, well perhaps I can just replace that part that the chain connects to and call it a day because the rest of it looks the same. But, things aren't as they seem. Though they're the same part number, they're not created equal (in the sense my original was manufactured in 2000) and is slightly larger. So, you can't be lazy with this -sadly- and you will need a large oil filter wrench too. The tank bolts & seals worked, but not as well manufactured as the originals. All in all a worthwhile replacement. ... show more
Reviewed in the United States on July 14, 2026 by JB
Exact Fit - No Surprises
This product worked perfectly for me. Its' size was an exact match for the original, and I was able to install it with no difficulty whatsoever. This fits the "rapid flush" series of American Standard toilets (with 3" opening), and I recommend it as an exact replacement for the original "flapper" assembly. ... show more
Reviewed in the United States on June 3, 2026 by Octagon
Leak solved
Worked well but didn’t come with a wrench to tighten the large base nut
Reviewed in the United States on August 23, 2026 by Merlin Calkins
Toilet tank valve
Item works great! No issues! Would buy again!
Reviewed in the United States on August 13, 2026 by Richard D.
As described
Was able to replace the tank seal with ease and it fit as hoped in an American standard toilet.
Reviewed in the United States on August 18, 2026 by Sarah Hartman
Weighted Washer
Cheaper and easier to install than a complete drain unit. I glued a heavy metal washer inside to add weight and ensure a tighter fit to avoid future leaks.
Reviewed in the United States on July 26, 2026 by DEB
Seriously?
It's not the government, the school systems, or a lack of values that is ruining America. It's the engineers who designed this flush valve and the corporate numb-nuts at American Standard that green-lit it's distribution! In order to get this thing to work properly you need to adjust the float to the highest level, and then it won't fit in the tank, or just plain won't go high enough to work at all. Forget adjustments or troubleshooting without having to drain half the tank every time you remove a part. (yes, i tried adjusting the float while still installed in the tank, but the champion tank is too small to allow the stem to turn, it HAS to be removed and therefore wastes a gallon of water for every adjustment). Another flaw is the chain connection. It twists and catches on itself every so often, keeping the valve from shutting, causing the toilet to run. Loosening the chain won't remedy this because now the valve won't stay open long enough for a sufficient amount of water to cause the valve to flush completely. I've had to plunge this toilet every couple of weeks because this valve is so ridiculously ineffective. There are 3rd party flappers that will fit the wide tank opening and sit much lower. Buy one of those instead of this trash. ... show more
Reviewed in the United States on June 1, 2024 by Matt
Great replacement part
Works good, great replacement easy to install
Reviewed in the United States on July 21, 2026 by Michael Martin
How it works
Checking for best price...