Top 10 Radiator Stop Leak Heavy Duty – Radiator Sealers

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1. Bar's Leaks


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

Bar's Leaks #ad - Lubricates water pump seals. Seals leaks. Helps control electrolysis. Conditions cooling system. Inhibits rust and corrosion.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height6 Inches
Length3 Inches
Weight0.69 Pounds
Width3 Inches
Part NumberPLT11
WarrantySee manufacturer

2. Bar's Leaks


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

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

3. Bar's Leaks


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

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

4. Liqui Moly


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

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

5. Versachem


Versachem 14109-12PK Heavy Duty Radiator Stop Leak, 1 oz., Pack of 12

Versachem #ad - Compatible with antifreeze. Works quickly and easily to stop larger leaks in the radiator. Water resistant. Prevents rust. Contains pure copper particles, and special hardening and sealing agents to fill holes.
BrandVersachem #ad
ManufacturerVersachem #ad
Part Number14109-12PK

6. Cyclo


Cooling System Stop Leak & Sealer, Cyclo

Cyclo #ad - Quickly finds and seals leaks with natural fibers. Circulates without clogging. Polishes water pump seals thus preventing leaks. Safe for all cooling systems.
BrandCyclo #ad
ManufacturerCyclo #ad
Height36 Inches
Length72 Inches
Weight0.5 Pounds
Width36 Inches
Part NumberC52-EACH



G-PLUS 2 Row 42MM Aluminum Cooling Racing Radiator Stop Leak Compatible With 1992-2000 HONDA CIVIC D15 D16 EG EK SOHC

G-PLUS #ad - Any question pls feel free to contact. Overall size: 464mm × 369mm × 60mm. Superior Durability and Impact Resistance. Meets the original Equipment OE standards, ensuring replacement fit just like the original.

Produced under strict quality control standards, easy to install. Compatibility: compatible with honda civic d15 d16 eg ek sohc 1992 1993 1994 1995 1996 1997 1998 1999 2000 Core size in approx: 350mm × 348mm × 42mm. Dimension: inlet/outlet size: 28mm/28mm. Fast shipping: Directly shipping from USA. Oe standard: heavy-duty aftermarket replacement at an affordable price. Easy installation: no modification Requires.
BrandG-PLUS #ad
ManufacturerGplusmotor #ad
Height17.32 Inches
Length21.26 Inches
Weight8.86 Pounds
Width6.69 Inches
Part Number02ARA8303SSL
Warranty1 year warranty



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

KALIMEX LTD #ad - Mixes with All Antifreeze. No draining Or Flushing. Fixes cracks and leaks in radiator, freeze Plugs, Cylinder Heads, head gasket, Heater Core, Water Pump Casing And Engine Blocks. Permanent coolant leak Repair - Just Shake, Pour And Go.
ManufacturerK-Seal #ad
Height6 Inches
Length7.87 Inches
Weight0.6 Pounds
Width2 Inches
Part NumberST5501
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

9. K-Seal


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

K-Seal #ad - Permanent coolant leak repair - Just shake, pour and go. Mixes with all antifreeze. Fixes cracks and leaks in radiator, cylinder heads, heater core, freeze plugs, head gasket, water pump casing and engine blocks. 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. No draining or flushing.
BrandK-Seal #ad
ManufacturerK-Seal #ad
Height1.9 Inches
Length5.9 Inches
Width4.1 Inches
Part NumberST5516
WarrantyWhen K-Seal makes a repair we guarantee it will be permanent

10. Bar's Leaks


Bar's Leaks Radiator Stop Leak 2X Concentrate, 6 oz.

Bar's Leaks #ad - Country of origin :United States. Product type :auto ACCESSORY. Package dimensions :4. 064 cm l x6. 096 cm w x12. 446 cm H. Package weight :081lbs.
BrandBar's Leaks #ad
ManufacturerBar's Leaks #ad
Height6.5 Inches
Length1.8 Inches
Weight0.42 Pounds
Width3 Inches
Part Number1194