Justice Brothers Radiator Stop-Leak

Justice Brothers Radiator Stop-Leak – RSL-2C

Seal Cooling System Leaks Fast—Drive with Confidence

Protect your engine from costly overheating and coolant loss with Justice Brothers Radiator Stop-Leak, available at NorCal Diesel Performance. This proven formula is designed to quickly seal leaks in radiators, head gaskets, engine blocks, soft plugs, valve ports, and heaters—so you can get back on the road with peace of mind.

Key Features & Benefits

• Seals Leaks While You Drive: Instantly finds and seals leaks in radiators, head gaskets, blocks, soft plugs, valve ports, and heater cores—even under pressure up to 25 lbs.

• Will Not Clog Cooling System: Safe for all cooling system components and will not block coolant flow or heater cores.

• Harmless to All Cooling System Parts: Compatible with all types of antifreeze and coolants, and safe for aluminum, plastic, and rubber parts.

• Lubricates Water Pump: Contains special lubricants to protect and extend the life of your water pump.

• Mixes with All Coolants: Works with any type of antifreeze or coolant for easy, universal application.

• Fleet-Tested Reliability: Trusted by professional fleets and everyday drivers for decades to provide a reliable, temporary repair until permanent service can be performed.

How to Use

1. Ensure engine is off and cool before starting.

2. Remove the radiator cap.

3. Start the engine and run for about 5 minutes to bring it to operating temperature.

4. Turn on the heater.

5. Shake the can well and pour the entire contents into the radiator.

6. Make sure the radiator is filled to the normal level, then replace the radiator cap.

7. One can treats systems up to 24 quarts in capacity.

Product Details

Why Choose Justice Brothers Radiator Stop-Leak?

Justice Brothers Radiator Stop-Leak is a trusted solution for emergency cooling system repairs—used by fleets, mechanics, and drivers worldwide. It’s ideal for sealing leaks and getting you safely to your destination or repair shop without risk of clogging or damaging your system. Customers consistently report excellent results and peace of mind from this reliable, easy-to-use product.

Order with Confidence

• Fast, flat-rate shipping

• 30-day returns

Stop leaks and protect your engine—order Justice Brothers Radiator Stop-Leak today from NorCal Diesel Performance!