Top 10 Stop Leak Coolant – Fuel Leak Detectors

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1. Bar's Leaks

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16.9 oz , Gray, Bar's Leaks 1186 Liquid Aluminum Stop Leak

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Bar's Leaks #ad - Bar's leaks liquid aluminum stop leak seals radiator leaks. Special shipping information: This item cannot be returned and has additional shipping restrictions. Seals freeze plug leaks. Repairs gasket leaks. Lowers water temperature. Seals freeze plug leaks. Repairs gasket leaks and heater core leaks. Seals radiator leaks.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height7.4 Inches
Length2.6 Inches
Weight1.2 Pounds
Width2.6 Inches
Part Number1186
Model1186
Warranty1 year manufacturer

2. K-Seal

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Blue, K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair

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K-Seal #ad - No draining or flushing. Fixes cracks and leaks in radiator, freeze plugs, head gasket, heater core, cylinder heads, water pump casing and engine blocks. Mixes with all antifreeze. If product did not seal head gasket leak, which causes back pressure and doesn't allow the product to reach the problem area, the system might be Over-pressurized, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully. Permanent coolant leak repair - Just shake, pour and go.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height6 Inches
Length7.87 Inches
Weight0.6 Pounds
Width2 Inches
Part NumberST5501
ModelST5501
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

3. Bar's Leaks

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Grey , Bar's Leaks Cooling System Repair ,, 16.9 oz -1150

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Bar's Leaks #ad - Country of Manufacture: United States. Stops cooling System Leaks. Compatible with all brands of anti-freeze including conventional green or blue and extended life red/orange or yellow OAT/HOAT coolant. Premium carbon Fiber Formulation For Extended Protection.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height8.4 Inches
Length1.8 Inches
Weight1 Pounds
Width3.6 Inches
Part Number1150
Model1150
WarrantyNo

4. K-Seal

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K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

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K-Seal #ad - If product did not seal head gasket leak, which causes back pressure and doesn't allow the product to reach the problem area, the system might be Over-pressurized, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully. Mixes with all antifreeze. Permanent coolant leak repair - Just shake, pour and go. No draining or flushing. Fixes cracks and leaks in radiator, freeze plugs, head gasket, heater core, cylinder heads, water pump casing and engine blocks.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height1.9 Inches
Length5.9 Inches
Weight1 Pounds
Width4.1 Inches
Part NumberST5516
ModelST5516
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

5. Bar's Leaks

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18 oz., Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak

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Bar's Leaks #ad - Repairs heater core leaks. Repairs blown head gaskets. Repairs blocks. Repairs freeze plug leaks. Seals larger leaks seals.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height2.6 Inches
Length7.5 Inches
Weight1.3 Pounds
Width2.6 Inches
Part Number1109
Model1109

6. Bar's Leaks

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Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak, 11 oz.

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Bar's Leaks #ad - Seals leaks. Conditions cooling system. Inhibits rust and corrosion. Helps control electrolysis. Lubricates water pump seals.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height6 Inches
Length3 Inches
Weight0.8 Pounds
Width3 Inches
Part NumberPLT11
ModelPLT11
WarrantySee manufacturer

7. Liqui Moly

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0.25 l, Liqui Moly 20132 Radiator Stop Leak, 1 Pack

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Liqui Moly #ad - Secures the combustion chamber from damages caused by coolant admission. Liqui moly radiator stop-leak completely seals such leaks immediately with ease.  . For all cooling water and heating systems with and without water filters.
BrandLiqui Moly #ad
ManufacturerLiqui Moly #ad
Height0 Inches
Length0 Inches
Width0 Inches
Part Number20132
Model20132

8. KALIMEX LTD

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K-Seal ST3501 Pour and Go Permanent Head Gasket and Block Repair

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KALIMEX LTD #ad - Fixes blown head gaskets, cracked heads and blocks. A permanent repair, guaranteed for the lifetime of the engine. Scientifically tested - k-seal is the only product to have been successfully tested by the equipment at Brighton University and classes as meeting the demands of ASTM D3147.

Just pour & go – no need for expensive head Gasket Repairs - The Safe and Easy Way to Fix a Coolant Leak. If product did not seal head gasket leak, which causes back pressure and doesn't allow the product to reach the problem area, the system might be Over-pressurized, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully.
BrandKALIMEX LTD #ad
ManufacturerSolv-TecA #ad
Height8 Inches
Length2.5 Inches
Weight1 Pounds
Width2.5 Inches
Part NumberKSLST3501
ModelKSLST3501
WarrantyLifetime warranty does not cover abuse

9. Genuine GM

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Pack of 5, Genuine GM 12378255 Fluid 3634621 Cooling System Seal Tablet, 4 Grams

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Genuine GM #ad - Non-toxic. For use with all vehicles. Dex-cool compatible. Engine application is based on liters of volume in cooling system. Formulated for automotive use.
BrandGenuine GM #ad
ManufacturerGM #ad
Weight0.07 Pounds
Part Number12378255
Model12378255

10. Bar's Leaks

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11 oz. , Grey, Bar's Leaks 1196 Radiator Stop Leak

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Bar's Leaks #ad - Stops and seals coolant leaks. One bottle treats up to 4 gallons. Works with all types and colors of anti-freeze coolant. One bottle treats up to 4 gallons. Stops and seals coolant leaks. Works with all types and colors of anti-freeze coolant.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height5 Inches
Length1.6 Inches
Weight0.5 Pounds
Width2.4 Inches
Part Number1196
Model1196
WarrantyNo