K-Seal
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K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
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K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
Secouez, versez et allez simplement le joint k st5516 HD Multi Purpose One Step Permanent Coolant.
K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required
Item #: 956684

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

Item #: 956684

TTD 203

TTD 257

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*All items will import from US

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Order now and get it around Friday, July 10
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Secouez, versez et allez simplement le joint k st5516 HD Multi Purpose One Step Permanent Coolant.
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What Stands Out

Permanent Solution
K-Seal provides a permanent fix for coolant leaks and cracks in various engine components, ensuring long-lasting protection and reducing the need for frequent repairs.
Versatile Application
Designed for multiple uses, K-Seal effectively seals leaks in radiators, head gaskets, and water pumps, making it suitable for a wide range of vehicles and machinery.
Easy to Use
The 16oz bottle allows for straightforward application; simply pour into the cooling system. No complicated steps or tools needed, making it accessible for all users.

Product Details

Repair coolant leaks with K-Seal ST5516 HD. Effective for large engines, radiators, cylinder heads, and more. Shop now at Ubuy Trinidad and Tobago
  • Permanent coolant leak repair with K-Seal ST5516 HD
  • Mixes with all antifreeze with no draining or flushing required
  • Fixes cracks and leaks in radiator, head gasket, freeze plugs, cylinder heads, and more
  • 16 fluid ounce bottle is effective for 60 quarts cooling capacity
  • Trusted by millions worldwide for fixing coolant leaks in water-cooled engines
  • Seals and fixes leaks with a unique formula without impacting the engine cooling efficiency
Package Weight3 Pound

Product Technical Details

Manufacturer‎Solv-Tec
Brand‎K-Seal
Model‎ST5516HD
Item Weight‎1.17 pounds
Product Dimensions‎5.9 x 4.1 x 1.9 inches
Item model number‎ST5516HD
Is Discontinued By Manufacturer‎No
Manufacturer Part Number‎ST5516

What's in the box

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Coolant Leak Repair, 16 oz

Who Should Buy?

Suitable For
  • DIY Car Owners

    Ideal for individuals who prefer quick and easy repairs without extensive mechanical knowledge or tools.

  • Older Vehicles

    Perfect for older cars with minor coolant leaks that require an efficient and long-lasting solution.

  • Emergency Situations

    Useful for urgent situations where immediate leak repair is necessary to prevent overheating or engine damage.

Not Suitable For
  • Severe Leaks

    Not suitable for large or critical leaks that require professional evaluation and extensive repairs.

  • High-Performance Engines

    May not be effective in high-performance or specialized engines where coolant integrity is crucial.

  • Routine Maintenance

    Not a substitute for regular maintenance; should not replace traditional coolant systems upkeep and checks.

Product Description

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is K-Seal ST5516 used for?

    Answer: K-Seal ST5516 is a heavy-duty, multi-purpose coolant leak repair solution designed to permanently seal leaks in your vehicle's cooling system. It effectively stops leaks in the radiator, heater core, head gasket, and other components. This product works by forming a strong seal on contact with leakage, making it ideal for both professional mechanics and DIY enthusiasts who want to extend the life of their vehicle's cooling system.
  • Question: How do you apply K-Seal ST5516?

    Answer: Applying K-Seal ST5516 is very straightforward. Simply shake the bottle, pour the contents directly into the radiator or overflow tank, and run the engine for about 10-15 minutes to ensure proper distribution. The product is designed to mix with all types of antifreeze, so no flushing of the system is required prior to use, making it a quick solution for unexpected leaks while you’re on the road.
  • Question: Is K-Seal ST5516 safe to use with all types of vehicles?

    Answer: Yes, K-Seal ST5516 is engineered to be safe for use with all types of vehicles, whether they operate on petrol or diesel. Its compatibility with all antifreeze types ensures that it can be used widely, from cars and trucks to heavy-duty machinery, making it an ideal choice for anyone experiencing coolant leaks regardless of their vehicle's make or model.
  • Question: Can K-Seal ST5516 seal leaks in head gaskets?

    Answer: Absolutely, K-Seal ST5516 is known for its effectiveness in sealing leaks in head gaskets. It creates a permanent seal that can withstand high temperatures and pressures, addressing common issues associated with head gasket failures. This makes it a valuable product for those noticing symptoms of a failing head gasket, potentially saving on costly repairs.
  • Question: What happens if K-Seal ST5516 fails to seal a leak?

    Answer: If K-Seal ST5516 does not seal a leak, it's essential to assess the situation comprehensively. Sometimes leaks may be too severe or may require more extensive repairs. In such cases, seeking professional assessment is advised. However, many users report satisfaction with the results, particularly for small to medium leaks, reflecting its effectiveness in most cooling system scenarios.
  • Question: How long does K-Seal ST5516 last once applied?

    Answer: Once applied, K-Seal ST5516 aims to provide a permanent seal. It's engineered to withstand the harsh conditions typical of a vehicle's cooling system for the life of the vehicle under normal conditions. This durability makes it a reliable option for those looking to mitigate leaks without frequent reapplication, allowing for peace of mind during drives.
  • Question: Will K-Seal ST5516 affect my vehicle's warranty?

    Answer: Using K-Seal ST5516 should not typically void your vehicle's warranty, but it’s important to consult your vehicle's warranty terms for specific stipulations regarding modifications and repairs. It's a widely used product among professionals and hobbyists alike, so many manufacturers acknowledge its use as a practical leak remedy. Always check with your dealer if unsure.
  • Question: Can K-Seal ST5516 be used for motorcycle coolant leaks?

    Answer: Yes, K-Seal ST5516 can be used for motorcycle coolant leaks. Its formulation is compatible with various cooling systems, including those found in motorcycles. The ability to work with all antifreeze types ensures that motorcyclists can address leaks swiftly and effectively, reducing the risk of overheating and further damage to their bikes.
  • Question: Where can I buy K-Seal ST5516 in Trinidad and Tobago?

    Answer: You can buy K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair from Ubuy in Trinidad and Tobago. Ubuy offers a variety of automotive products, including this effective coolant leak repair solution, providing an easy online shopping experience tailored to your automotive needs.
  • Question: How effective is K-Seal ST5516 for preventing future leaks?

    Answer: K-Seal ST5516 not only repairs existing leaks but also plays a role in preventing future leaks by sealing cracks within the cooling system as they develop. This proactive repair approach helps maintain the integrity of your vehicle's cooling system over time, making it a smart addition to regular vehicle maintenance, especially for older cars or those with pre-existing issues.

K-Seal Antifreezes & Coolants ‎ST5516HD Editorial Review

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Customer Reviews & Ratings

4.4
1653 customers ratings
  • 5 Star
    74%
  • 4 Star
    11%
  • 3 Star
    4%
  • 2 Star
    4%
  • 1 Star
    7%

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MT
Mohd
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“The product received very good packaging & safe…Thank You”

16 June 2026 · via Trustpilot
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Shawati
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“Accurate delivery timing given”

16 June 2026 · via Trustpilot
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Youcef
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“Not madly expensive like I thought, and much quicker than promised.”

15 June 2026 · via Trustpilot
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Leila
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“Never dealt with Ubuy before, but everything worked out great. Seamless cross border purchasing and shipping. Thanks!”

6/7/2026 · via Trustpilot
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Kwame
Verified buyer

“The process was smooth, with clear communication and timelines. This was my 1st purchase and I am really impressed. I will definitely be coming back.”

12 June 2026 · via Trustpilot
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Important information

  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
  • Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.

TTD 203

TTD 257

Order now and get it around Friday, July 10

QTY:

Secured transactionsecured transaction

Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.

Our Top Logistics Partners
  • fedex
  • dhl
Fastest cross-border delivery

Features & Benefits

  • Permanent repair for coolant leaks.
  • Compatible with all antifreeze mixtures.
  • No draining or flushing required.
  • Fixes cracks and leaks in radiators and engine blocks.
  • Easy application - just shake, pour, and go.
  • Ideal for various engine components including gaskets and heating cores.