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10 bestCooling System Sealerof December 2025

112M consumers helped this year.

1

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

K-Seal

9.9

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10% off

2

Wynn's Engine Oil Stop Leak Sealer Treatment Additive For All Engine Types 325ml & Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Wynn's Engine Oil Stop Leak Sealer Treatment Additive For All Engine Types 325ml & Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Wynn's Engine Oil Stop Leak Sealer Treatment Additive For All Engine Types 325ml & Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Wynn's

9.8

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3

Aircon Blue Top up + Green Leak

Aircon Blue Top up + Green Leak

Aircon Blue Top up + Green Leak

BASSFACE

9.5

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4

Car Aircon Air Con Air Conditioning Gas Top up Recharge Refill Regas Tool Kit

Car Aircon Air Con Air Conditioning Gas Top up Recharge Refill Regas Tool Kit

Car Aircon Air Con Air Conditioning Gas Top up Recharge Refill Regas Tool Kit

Aircontopup

9.3

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5

AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging

AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging

AMK® Holts Radweld Plus 250ml Coolant Leak Repair Suitable for All Cars No Clogging Works in Whole System Permanent Non Damaging

AMK

9.0

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OtherRelated productsUp to 10% off

2KG1MA Aircon Refill Regas Air Conditioning Topup R1234yf + LeakStopper Mixture 444gr X2 + 30ml Leak Sealer

2KG1MA Aircon Refill Regas Air Conditioning Topup R1234yf + LeakStopper Mixture 444gr X2 + 30ml Leak Sealer

Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

Wynn's Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

Holts 1831469 Radweld Plus New Formula 250ml

Holts 1831469 Radweld Plus New Formula 250ml

6

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

ARZER

8.8

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31% off

7

QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

QuickFill - SEL9260: Central Heating Dosing Tool - Add Chemicals Like Fernox Central Heating Inhibitor, Sludge Remover, Leak Sealer & Sentinel X100 to Your Central Heating System

SPI

8.5

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17% off

8

Nestling Heat Sealer Plastic Bag Sealer Impulse Sealer Black Vacuum Food Sealer Bag Packing Machine for PP and PE Plastic Bag Sealer (300mm)

Nestling Heat Sealer Plastic Bag Sealer Impulse Sealer Black Vacuum Food Sealer Bag Packing Machine for PP and PE Plastic Bag Sealer (300mm)

Nestling Heat Sealer Plastic Bag Sealer Impulse Sealer Black Vacuum Food Sealer Bag Packing Machine for PP and PE Plastic Bag Sealer (300mm)

Nestling

8.2

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9

AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak

AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak

AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak

AMK

7.9

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10

MAGIC SEAL 16'' Commercial Vacuum Sealer Machine, Meat Sealer Vacuum Packing Machine with Double Pump and Auto Cooling System, Sealing and Vacuum Time Control, Compatible with Mylar Bags

MAGIC SEAL 16'' Commercial Vacuum Sealer Machine, Meat Sealer Vacuum Packing Machine with Double Pump and Auto Cooling System, Sealing and Vacuum Time Control, Compatible with Mylar Bags

MAGIC SEAL 16'' Commercial Vacuum Sealer Machine, Meat Sealer Vacuum Packing Machine with Double Pump and Auto Cooling System, Sealing and Vacuum Time Control, Compatible with Mylar Bags

MAGIC SEAL

7.7

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