Heavy Duty Stop Leak – 345 ml

  • Capacity: 345 ml
  • Item Number: C1-11
  • QTY/CTN: 24 PCS
  • Color: Colorless
  • State: Liquid Additive
  • Application: Car Radiator
  • Size: D 64 H 142 mm (D: diameter, H: height)
SKU: C1-11 Categories: , Tag:

Heavy Duty Stop Leak

THIS® Radiator Heavy Duty Stop Leak is specially formulated to seal larger leaks better than other stop-leak products. The radiator heavy duty stop leak works safely and effectively on plastic, aluminum and metal radiators. 


  1. Compatible with petroleum, semi-synthetic and full synthetic motor oils.
  2. Renews worn seals with no risk of damage or eventual corrosion.
  3. Reduces engine noise and oil consumption, while raising oil pressure.
  4. Contains no harmful solvents.


Cooling systems that are dirty or partially clogged should be flushed before usage.

  1. Shake well. Pour Stop Leak into a cool radiator. If direct access to radiator is not available, install in overflow tank. One bottle treats up to 3 gallons. Use 2 bottles for larger systems.
  2. Fill radiator and overflow tank to proper level and reinstall cap.
  3. Drive/idle engine for 15 to 30 minutes.


  1. Keep out of reach of children.
  2. Store in a cool and dry place, and avoid direct sunlight.
  3. In case of contact with eyes, please flush with a great of water and go to the hospital immediately
  4. To avoid injury, use extreme care when removing radiator cap when engine is hot.
  5. For eyes or skin contact, flush with water for 15 minutes.

More Information

Place of Origin Guangdong, China (Mainland)
Brand Name THIS
Model Number C1-11
Weight Normal
Use fast-acting, permanent seal
Expiration Date 3 years
Carton Size 42*28*15cm
QTY/CTN 24pcs
G.W. 8.21kg
N.W. 7.92
Content 354ml
Function Sealer in seconds
State Liquid Additive
Application Car Radiator
Characteristic Safe Formula

Questions and Answers

1.Are you a manufacturer?
A: Yes, We Comma Car Care Accessories Co., Ltd is a professional manufacturer, we have been committed to car care products research and development around 10 years.

2.What kinds of car care products do you have?
A: Our products divide into Rubber Spray, Spray Paint, Car Wax, Cooling System Care, Fuel Additives, Car Polish, Air Freshener and etc.

3.What are your terms of delivery?

4.How about your delivery time?
A: Generally, it will take 25 to 30 days after receiving your advance payment.

5.Can you provide the sample?
A: Yes, we can provide 2-3 free samples, Comma spend on samples is 1 million RMB per year.

Get A Quote