$12.47
FREE Shipping on your first order. Details & FREE Returns
Return this item for free
  • Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
  • Learn more about free returns.
How to return the item?
Arrives: Friday, Aug 21
Fastest delivery: Wednesday, Aug 19 Details
In Stock.
Your transaction is secure
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Ships from and sold by Amazon.com.

Other Sellers on Amazon
Add to Cart
$12.47
& FREE Shipping on eligible orders. Details
Sold by: Global Media 1
Add to Cart
$14.99
& FREE Shipping on eligible orders. Details
Sold by: GlobalEcom
Add to Cart
$14.99
+ Free Shipping
Sold by: JBTools
Have one to sell?

K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, and Freeze Plug - Pour and Go - Trade Trusted-Stop Leak

by K-Seal
4.1 out of 5 stars 2,332 ratings

List Price: $14.99
Price: $12.47 FREE Shipping on your first order. Details & FREE Returns
Return this item for free
  • Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
  • Learn more about free returns.
How to return the item?
You Save: $2.52 (17%)
    This fits your .
  • Make sure this fits by entering your model number.
  • REPAIRS IN MINUTES: Formulated to permanently weld radiators, including hard plastic aluminum heads and blocks in old and new cars. The only car radiator and gasket sealant university tested to meet ASTM D3147. Save time/money. US Bestseller
  • SEALS CRACKS AND STOPS LEAKS: A DIY alternative to costly repairs, our coolant leak fix permanently seals cracks and holes! It quickly repairs your leaking radiator, freeze plug, heater core and water pump casing with no adverse impact on efficiency.
  • POUR AND GO: Our cooling system sealer is easy to use: just shake the bottle, add to your radiator/overflow and run the engine! Unlike some traditional products, it mixes with all types of antifreeze, absolutely no draining or flushing required.
  • SCIENTIFICALLY TESTED: Safe and effective, our cracked block repair can seal leaks up to 1/32 of an inch! Once cured, the repair withstands the high pressure of the combustion chamber, all without failing or clogging the cooling system.
  • CUSTOMER SUPPORT: If K-Seal engine coolant leak stop doesn’t seal, the system might be over-pressurized. Check the Technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold worldwide!
See more product details
New (12) from $14.99 + FREE Shipping

Frequently bought together

  • K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, and Freeze Plug - Pour and Go - Trade Trusted-Stop Leak
  • +
  • ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle
  • +
  • Lucas Oil 10278 Engine Oil Stop Leak
Total price: $36.43
Buy the selected items together

Special offers and product promotions

Have a question?

Find answers in product info, Q&As, reviews

There was a problem completing your request. Please try your search again later.
All Product Information Customer Q&A's Customer Reviews

Your question may be answered by sellers, manufacturers, or customers who purchased this item, who are all part of the Amazon community.

Please make sure that you are posting in the form of a question.

Please enter a question.


Product information

Technical Details

Technical Specification

Additional Information

Product description

K-Seal 8 fluid ounce bottle is effective to 20 quarts cooling capacity. Just shake, pour and go. It repairs leaks and cracks in radiator, head gasket, heater core, freeze plugs, water pump casing, cylinder heads and engine blocks.


From the manufacturer


Customer Questions & Answers

Customer reviews

4.1 out of 5 stars
4.1 out of 5
2,332 customer ratings
How does Amazon calculate star ratings?
Reviewed in the United States on May 15, 2016
993 people found this helpful
Comment Report abuse
Reviewed in the United States on April 2, 2018
Verified Purchase
96 people found this helpful
Comment Report abuse
Reviewed in the United States on January 21, 2018
Verified Purchase
135 people found this helpful
Comment Report abuse
Reviewed in the United States on August 17, 2016
Verified Purchase
65 people found this helpful
Comment Report abuse

Top international reviews

Alex
5.0 out of 5 stars but good for a cheap fix on a cheap motor that ...
Reviewed in the United Kingdom on November 8, 2017
Verified Purchase
20 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
D
5.0 out of 5 stars Excellent product that works!!!
Reviewed in the United Kingdom on February 28, 2019
Verified Purchase
10 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
Miss J
5.0 out of 5 stars BRILLIANT!!!!
Reviewed in the United Kingdom on November 18, 2017
Verified Purchase
15 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
D. Gray
4.0 out of 5 stars Fixed leaky heater matrix in a few minutes
Reviewed in the United Kingdom on June 10, 2019
Verified Purchase
6 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
James S
5.0 out of 5 stars Fixed an EGR leak
Reviewed in the United Kingdom on December 3, 2017
Verified Purchase
10 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
F. Passaro
5.0 out of 5 stars USE THE RIGHT AMOUNT - FOLLOW DIRECTIONS AND YOU WILL GET RESULTS.
Reviewed in the United Kingdom on October 29, 2019
Verified Purchase
3 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
N. WILLCOCKS
4.0 out of 5 stars Yes but ....
Reviewed in the United Kingdom on July 30, 2018
Verified Purchase
5 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
M1ndf1r3
5.0 out of 5 stars The cure for bedwetting
Reviewed in the United Kingdom on December 7, 2017
Verified Purchase
12 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
Piotr Okonski
5.0 out of 5 stars Good Product bought it for me BMW e61 530d (unknown ...
Reviewed in the United Kingdom on July 11, 2017
Verified Purchase
13 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
Jones
5.0 out of 5 stars Brilliant!!!!!
Reviewed in the United Kingdom on September 28, 2019
Verified Purchase
One person found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
Engineer
1.0 out of 5 stars Totally ineffective
Reviewed in the United Kingdom on August 7, 2018
Verified Purchase
3 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
Mark R.
5.0 out of 5 stars This product is a must have
Reviewed in the United Kingdom on January 31, 2019
Verified Purchase
3 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
goodbobbie
1.0 out of 5 stars bought as as stopgap but now failed
Reviewed in the United Kingdom on November 20, 2018
Verified Purchase
One person found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
Kieran Odey
5.0 out of 5 stars Fantastic Product
Reviewed in the United Kingdom on February 14, 2019
Verified Purchase
3 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
Ray C Pollock
5.0 out of 5 stars Excellent - This really works
Reviewed in the United Kingdom on September 13, 2016
Verified Purchase
8 people found this helpful
Sending feedback...
Thank you for your feedback.
Report abuse
Pages with related products. See and discover other items: car cooling system, engine block sealant, engine gaskets, steel seal, best oil additive for engine, block heaters