Walmart US Ecommerce Website

GENERAL MERCHANDISE

PHARMACY

GROCERIES

VUDU

SPARK

PHOTO

ADVERTISING

SAVINGS CATCHER

GIFTCARDS

INHOME

AFFILIATE

ONEAPP

LOTUS

HELP

SMART_REORDER

GROCERY

CONV_COMMERCE

Try it free

Glass WEB: BTS x Walmart + "Non Member" PIP Banner Wk 26 2026

Buy Box Ad Container Module for Desktop

Custom HTML Module - About Klarna

Custom HTML Module - About SalesFinancing - Second update

You'll choose a plan at checkout.

#515357

I want delivery savings with Delivery Pass

#0071dc

NEW Fulfillment Tue Apr 15 2025 2:17 PM EDT

MTZ Team | Marquee 1 Ad | Item Page

MTZ Team | Marquee 2  Ad | Item Page

MTZ Team | Skyline Ad | Item Page

Other products of interest

MTZ Team | Sponsored Product Carousel - Item Page

More items to explore

MTZ Team | Sponsored Product Carousel - Item Page Broad 

NEW AddonServicesRedesign Fri Jul 18 2025 1:30 PM EDT

NEW AddToCart Mon Jul 14 2025 3:50 PM EDT

NEW AddToCart Tue Apr 15 2025 2:19 PM EDT

NEW BrandBoxDisplayAd Mon Jul 14 2025 9:14 PM EDT

NEW BrandLink Wed Apr 23 2025 12:07 AM EDT

NEW Breadcrumb Mon Apr 07 2025 8:23 PM EDT

Walmart Rewards Mastercard

NEW FinancingOptions Tue Dec 10 2024 3:32 PM EST

I want shipping & delivery savings with

NEW Fulfillment Mon Jul 14 2025 4:00 PM EDT

NEW InternationalShipping Mon May 18 2026 1:02 PM EDT

New Item Page - Nutrition Value Placeholder Module, Wednesday, February 08, 2023, 5:11:53:90 pm

New Item Page - Product Description Placeholder Module, Wednesday, February 08, 2023, 5:14:04:38 pm

New Item Page - Product Ingredients Placeholder Module, Friday, February 10, 2023, 10:34:23:79 am

New Item Page - Product Specifications Placeholder Module, Wednesday, February 08, 2023, 5:15:29:61 pm

New Item Page - Reviews Placeholder Module, Wednesday, March 22, 2023, 10:04:29:34 am

New Item Related Shelves Module, Thursday, June 15, 2023, 6:08:51:10 am

 Price Match Policy

Prices, terms, and availability may vary online, in stores, and in–app. If the advertised price is not shown here, inventory at the advertised price may now be sold out. Please see the other offers, if available, while quantities last. Some items may be available from Marketplace Sellers, who set their own prices, and are not eligible for price match. Items sold in store by Walmart may be eligible for a price match to online items shipped and sold by Walmart. For variable weight items, price shown is an estimated price only – you will be charged for the actual weight of the item. See our

NEW LegalPriceDisclaimer Mon Jul 14 2025 4:11 PM EDT

NEW LegalPriceDisclaimer Wed Apr 30 2025 12:13 AM EDT

NEW ListsAndRegistries Tue Apr 15 2025 4:50 PM EDT

NEW PaymentPlans Mon Jul 14 2025 4:15 PM EDT

NEW PaymentPlans Tue Apr 15 2025 1:31 PM EDT

NEW PriceInformation Tue Apr 15 2025 1:30 PM EDT

NEW ProductDescriptionPlaceholderATF Tue Jul 08 2025 11:41 PM EDT

NEW ProductFlags Thu Apr 10 2025 11:42 PM EDT

NEW ProductHighlightsPlaceholder Wed Jul 02 2025 12:43 AM EDT

NEW ProductImages Tue Apr 15 2025 2:13 PM EDT

NEW ProductName Tue Apr 15 2025 12:53 PM EDT

NEW ProductReturnPolicyDetails Tue Dec 10 2024 3:17 PM EST

NEW ProductReturnPolicy Mon Jul 14 2025 5:04 PM EDT

Return Policy

NEW ProductReturnPolicy Tue Apr 15 2025 2:28 PM EDT

NEW ProductStickyBuyBox Wed Jul 02 2025 12:55 AM EDT

NEW PromoDiscount Tue Apr 15 2025 6:53 PM EDT

New SellersSecondaryBuyBox Module, Tuesday, September 05, 2023, 4:02:21:76 pm

Shop Confidently

NEW ShopWithConfidence Thu Jan 15 2026 2:20 PM EST

NEW SocialProofMessage Tue Apr 15 2025 7:17 PM EDT

NEW SoldAndShippedBy Mon Jul 14 2025 5:04 PM EDT

NEW SoldAndShippedBy Tue Apr 15 2025 2:23 PM EDT

New!

More savings, less stress.

HSK_Subscribetosave_E_v2

NEW SubscriptionOptionsModule Tue Apr 15 2025 6:44 PM EDT

NEW SubscriptionPriceMessage Wed Apr 23 2025 6:48 PM EDT

NEW Variants Wed Apr 23 2025 11:01 PM EDT

[Sticky] BuyBoxAd Mon Aug 11 2025 3:59 AM EDT

[Sticky] PriceInformation Mon Jul 14 2025 4:03 PM EDT

Syndigo

True

dWeb: L1/L2- Comparison Chart- WK 07, 2026

#000000

Item Carousel - Rich Relevance 1

RR carousel

Item Carousel - Rich Relevance 2

RR carousel 2

Item Carousel - Rich Relevance 3

K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz

<ul><li>Effective Leak Repair: Seals leaks in the head gasket and engine block using advanced fibers, nanotechnology, and Cool-X Conditioner.</li><li>Wide Vehicle Compatibility: Works with all types of antifreeze and is suitable for multiple vehicle types, including cars, trucks, SUVs, and vans.</li><li>Restores Performance: Helps prevent overheating by restoring cooling system efficiency and engine performance.</li><li>Trusted Automotive Brand: Made by K&W, a leader in professional-grade maintenance chemicals for automotive repair.</li><li>Quick and Easy Use: Delivers a fast, permanent fix for cooling system leaks without costly engine repairs.</li></ul>

Manufacturer Part Number

Compatible Cars

Vehicle Make

Vehicle Model

Vehicle Fitment Type

Brand

Material

Features

Vehicle Type

Model

Count Per Pack

Permanently repairs cracks in head gaskets, engine blocks, intake gaskets, cylinder heads, heater cores, freeze plugs and radiators-THE ULTIMATE SOLUTION for all coolant leaks!

Assembled Product Weight

Assembled Product Dimensions (L x W x H)

Universal Product Code (UPC check)

fulfillment

title_shipToHome_date_delivery

<!DOCTYPE html>
<html>
   <head>
      <meta name="viewport" content="width=device-width, initial-scale=1">
      <link
         rel="stylesheet"
         href="https://unpkg.com/tachyons@4.12.0/css/tachyons.min.css"
         />
   </head>
   <body>
      <div class="flex flex-column justify-center w-100 ph3 normal lh-copy pt1">
            <div class="tc">
               <img src="https://i5.walmartimages.com/dfw/8822aef6-7abe/k2-_f4ee767f-a90a-4f70-be39-71e5d7b238a0.v1.jpg">
               <h3>4 equal payments</h3>
               <h4 class="gray">Buy what you love and split the cost. It's that easy. </h4>
            </div>
            <ul>
            <b>
               <li>Add item(s) to your cart.</li>
               <li>
                  Add items to checkout and choose 
                  <image height="14" width="auto" src="https://i5.walmartimages.com/dfw/8822aef6-7abe/k2-_f4ee767f-a90a-4f70-be39-71e5d7b238a0.v1.jpg"></image>
               </li>
               <li>Enter your debit or credit card information. </li>
               <li>Your first payment is taken when the order is processed, and the remaining 3 are automatically taken every two weeks.</li>
            </b>
            </ul>
            <p class="gray">Please note that a higher initial payment may be required for some purchases. Pay later in 4 <a href="https://cdn.klarna.com/1.0/shared/content/legal/terms/0/en_ca/paylaterin4" target="_blank">terms</a> available here. For Quebec residents, these Pay Later 4 <a href="https://cdn.klarna.com/1.0/shared/content/legal/terms/0/en_ca/paylaterin4_quebec" target="_blank">terms</a> are applicable. </p>
      </div>
   </body>
</html>

We haven't used it yet but I would like to read reviews from others that purchased it please.

walmart.com

[This review was collected as part of a promotion.] Best overall antifreeze stop leak I've ever used. I kept having to use
 more and more antifreeze in my vehicle so I bought this and put it in and right after I did. I didn't have to add any more antifreeze for over a year. It still wasn't leaking for as long as I owned the car.

Antifreeze Stop Leak

I have used Bar's headgasket seal and K" headgasket seal but neither of them work on my Prius because of big lead on Aluminum block but CRC fiber did it.

High quality outstanding product!  Ended up with a head gasket or block leak due to lower radiator hose breaking which caused car to overheat.,  Used about a year ago on my 30 year old Toyota Corolla  instead of spending $600 or more for replaceming parts  and labor costs. Car continues to run smooth as before and the engine temp running a little lower than before due to special cooling agents!  Nothings a guarantee on every vehicle, however you are DEFINITELY   going to spend 20X plus as much if you  don't try it and have it repaired the old fashion way!   One automotive retail store told me they sell a fair amount of it and never had anyone come back to say it didn't work.

Fiberlock  is  Outstanding!!

[This review was collected as part of a promotion.] Saves a vehicle when it's a last resort. Used it on more then one occasion.

Great product

[This review was collected as part of a promotion.] It really works I used it on 3 cars

Guarantee

Very good product

[This review was collected as part of a promotion.] It didn't work for me

Don't buy

This did work on a blown head gasket for a 2016

[This review was collected as part of a promotion.] It comes from another company,not Walmart. 
And it is not the one in the picture as advertised
CRC changed the formula after purchasing K%26W so new stuff is not good at all. But they keep advertising with the old version.

Not the real one

K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz front-facing bright green plastic bottle with black screw cap and label showing K&W logo and product name; label lists repair applications for head gaskets, engine blocks, radiators and heater cores and the 32 fl oz size, and is often used to temporarily reduce small coolant seepage during short transport.