Hero image 0 of K-Seal Heavy Duty ST5516 Antifreeze & Coolant Stop Leak 16oz Bottle Treats Large Trucks, RVs, Bus and Tractors, 0 of 5
K-Seal Heavy Duty ST5516 Antifreeze & Coolant Stop Leak 16oz Bottle Treats Large Trucks, RVs, Bus and Tractors
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Key item features
- Heavy-Duty Repair: One-step permanent coolant leak repair for heavy-duty vehicles, designed for large cooling systems with capacities greater than 20 quarts.
- Versatile Compatibility: Compatible with all standard antifreeze and coolant types, and safe for use with metal, plastic, rubber, and composite cooling system components.
- Rapid Sealing: Begins sealing coolant leaks quickly as the product circulates, delivering fast-acting performance without requiring extended downtime.
- Extensive Application: Ideal for large trucks, RVs, tractors, agricultural equipment, and commercial vehicles, formulated for systems up to 50 quarts.
- Reliable Performance: Provides a durable, long-lasting repair for coolant leaks under heavy-duty operating conditions, sealing cracks, pinholes, and porosity.
- Simple Application: No draining or flushing required; simply shake, pour, and go, working while the engine is running without system disassembly.
Generated by AI
Specs
- ColorBlue
- Volume capacity16 fl oz
- FeaturesEasy Installation
- Vehicle fitment typeUniversal
- Compatible carsAll
- MaterialCopper, Zinc Gluconate
Reviews summary
Pros
- : Seals small to moderate-sized leaks.
- : Offered at a cost that is not too high or too low.
Generated by AI
Current price is USD$19.66$1.23/fl oz
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Columbus, 43215
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About this item
Product details
K-Seal HD Stop Leak is a one-step, coolant leak repair designed for heavy-duty, water-cooled vehicles. K-Seal HD Stop Leak 16oz is suitable for large cooling systems with capacities greater than 20 quarts, making it ideal for trucks, RVs, tractors, and other heavy-duty equipment. K-Seal HD repairs coolant leaks in radiators, hoses, heater cores, engine blocks, and blown head gaskets without the need for draining or flushing the system. This heavy-duty coolant stop leak is simple to use—just shake, pour, and go. K-Seal HD Stop Leak 16oz is compatible with all standard antifreeze and coolant types and is engineered to provide a reliable, long-lasting repair for demanding applications.
- • One-step permanent coolant leak repair for heavy-duty vehicles • No draining or flushing required—simply shake, pour, and go • Designed for large cooling systems with capacities greater than 20 quarts • Repairs leaks in radiators, hoses, heater cores, engine blocks • Compatible with all standard antifreeze and coolant types • Ideal for trucks, RVs, tractors, and other heavy-duty equipment • 16oz bottle formulated for demanding, high-capacity cooling systems
- • Provides a durable, long-lasting repair for coolant leaks under heavy-duty operating conditions • Helps seal leaks caused by cracks, and porosity • Works while the engine is running with no need for system disassembly • Safe for use with metal, plastic, rubber, and composite cooling system components • Does not clog radiators or heater cores when used as directed • Suitable for commercial, fleet, and recreational vehicle applications • Trusted solution for high-mileage and hard-working engines
- • Repairs coolant leaks caused by cracks, pinholes, and porosity throughout the cooling system • Seals leaks in radiators, hoses, and heater cores • Engineered to circulate and seal leaks while the engine is running • Designed for heavy-duty applications and high-capacity cooling systems • Safe for use with metal, plastic, rubber, and composite cooling system components
- • Begins sealing coolant leaks quickly as the product circulates through the cooling system • Delivers fast-acting performance without requiring extended downtime • Provides effective leak repair during normal engine operation • Helps reduce vehicle downtime for heavy-duty and commercial applications
- • Formulated for large, heavy-duty cooling systems up to 50 quarts • Ideal for large trucks, agricultural equipment, and commercial vehicles • Scalable dosing allows use in even larger cooling systems when needed • Designed for high-capacity, high-demand applications
- • Safe for use on aluminum, plastic, rubber, and composite cooling system components • Compatible with modern radiator and cooling system materials • Designed to seal leaks without damaging sensitive cooling system parts
- •#1 Brand for coolant stop leak solutions for automotive and heavy-duty applications • Proven formulation relied on by professionals and DIY users • Designed to deliver dependable performance in demanding cooling systems
- • 16 fl oz bottle formulated for very large and high-capacity cooling systems • Provides sufficient coverage for heavy-duty trucks and equipment • Sized specifically for demanding, large-vehicle applications
info:
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it.
Specifications
Brand
K-Seal
Color
Blue
Volume capacity
16 fl oz
Features
Easy Installation
Warranty
Warranty information
Money Back Guarantee
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Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
Warnings
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Customer ratings & reviews
How item rating is calculated
Reviews summary
Pros
- : Seals small to moderate-sized leaks.
- : Offered at a cost that is not too high or too low.
Generated by AI
Sort by |
Showing 1-3 of 24 reviews
Jul 11, 2025
CDREO
5 out of 5 stars review
Verified Purchase
Stops leaks
saw some brown residue in oil cap which is an indicator of water in the motor oil. As a precaution I poured the solution and let it run for a while. That was about 4 months ago and I haven't seen any signs of trouble.
Incentivized Review
Helpful?18DAI2B3QSTO30391262
Sep 27, 2020
HYUNGJO
5 out of 5 stars review
Verified Purchase
Wonderful Radiator Sealer
This is very good sealer. Last February My contractor ordered a New Diesel Generator($3376.00) to England. But the Factory could not send because of the COVID 19. So I applied this item and worked out to stop LEAKING.
Helpful?18DAI2B3QSTO30391262
Oct 9, 2024
WalmartCustomer
5 out of 5 stars review
Verified Purchase
K-Seal Heavy Duty Coolant Leak Sealer is a lifesaver! I used the 16 fl oz bottle on my RV, and it worked perfectly to stop a serious coolant leak. What impressed me the most was how quickly it sealed the leak and how easy it was to use—just pour it into the system, and it does the rest. It's been a few weeks now, and my engine is running smoothly with no more overheating issues. This product definitely saved me from an expensive repair bill, and I highly recommend it to anyone with large trucks, RVs, or tractors. Five stars for sure!
Helpful?18DAI2B3QSTO30391262
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Shipping, arrives in 3+ daysZerex Antifreeze Coolant,55 gal.,RTU ZXELRU2 $1,280.49 Was $1,348.55
Now$1,28049current price Now $1,280.49, Was $1,348.55$1,348.55You save $68.06You save$68.06Zerex Antifreeze Coolant,55 gal.,RTU ZXELRU2
Shipping, arrives in 3+ days