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Functional Fluid, Lubricant, Grease (including Additives)

Heavy duty multipurp coolnt leak repair
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Part # ST5516 | Line Code: KSL
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$29.49
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Not Fitted / Universal
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Product Details
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Permanent Repair Yes
Heater Core Leaks Yes
Snowmobile N
Personal Watercraft N
Small Engine N
Engine Specific N
Transmission Specific N
Application Specific N
High Performance Y
Medium Duty Truck Y
Heavy Duty Truck Y
Agricultural Equipment Y
Marine Y
Freight Class 65
Can Item be sold in all States Y
Car / Light Truck Y
Non-Vehicle Specific N
Industrial / Off Highway Equipment Y
Does this Item Contain VOCs N
Inner Type PDQ Box
EPA Number n/a
If Item is sold in California, does it prevent/Kill mold, mildew or bacteria. N
Case Type Box
Motorcycle / ATV N
Combustion Engine
Item is a PESTICIDE or not
Expiration Date, Manufacture Date
Part Terminology Head Gasket and Block Repair Liquid
Features & Benefits
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K-Seal HD (heavy duty) for large capacity cooling systems such as trucks/tractors, industrial, AG, and RV engines.
K-Seal HD is the best-selling trade trusted permanent total coolant leak repair. The super concentrated formula not only permanently repairs blown head gaskets it also seals leaks in the radiator, heater core, head, block, water pump and freeze plugs. K-Seal HD mixes with all antifreeze / coolant so there is no need to drain or flush the system before or after treatment, and just one bottle is all you need for engines up to 60 quarts. Simple to use simply Shake, Pour and Go! K-Seal HD can be added via the radiator, top hose or via the expansion tank provided it is safe to do so.
K-Seal HD uses a unique ceramic formula and contains NO sodium silicate or liquid glass so it will positively not clog any part of the cooling system. K-Seal HD also works on Hard Plastic and has been independently tested at Brighton University and conforms to the American Standard ASTM D-3147 for Stop-Leak Additives for Engine Coolants. Guarantee - Once we make the repair it is for the life of the engine.
  • Heavy Duty Application - Truck/Tractor, Industrial, AG, RV and Large Capacity Engines
  • Positively Will NOT Clog any Part of the Cooling System
  • No Draining / No Flushing
  • Unique Ceramic Formula with NO Sodium Silicate or Liquid Glass
  • Independently Tested to Meet ASTM D3147
  • Pre Packed in Attractive 6 Pack Counter Display
  • Permanently Seals Holes and Cracks up to 1/32\" in - Head Gaskets, Cracked Blocks, Leaking Radiators, Leaking Heater Cores, Leaking Freeze Plugs and Leaking Water Pump Casings.
  • Easy to Use - Just Shake Pour & Go!
  • Can be Added to the Overflow Tank
  • Can be Added to a Hot or Cold Engine (provided safe to open)
Application Summary
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1.Shake the bottle vigorously for 30 seconds and add the entire contents to the radiator or header/expansion tank. If adding to the radiator do not pour directly onto a hot radiator core. It does not matter if you add K-Seal products to a cold or hot engine but take care when working with a hot engine as the cooling system will be under pressure. Also K-Seal products are compatible with all types of antifreeze / coolant and are not affected by any other additives that may already be in the cooling system. If you are concerned that the coolant flow may already be restricted we recommend cleaning / flushing the cooling system prior to adding any K-Seal products.
2.Once K-Seal is in the cooling system run the engine up to operating temperature so that coolant is flowing freely around the cooling system. The quickest way is to take the vehicle for a gentle drive otherwise leave the engine idling until the temperature gauge reaches the normal level. The special formula flows together with the coolant and when it reaches the leak will then flow through the hole or crack and make a repair.
3.After any K-Seal product has made a repair it is not necessary to leave it in the system because the repair is permanent. You can either choose to replace the contents of the cooling system or leave the original K-Seal product in the system. If you have an over-pressurizing cooling system then please visit the K-Seal website for more information. Note: K-Seal is not suitable for oil to coolant leaks.

IMPORTANT: Please use extreme caution when working on a hot cooling system as hot coolant and gases could cause injury. If in doubt please consult a qualified mechanic.
Additional Resources
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Product Documentation

Safety Data Sheet
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