These Chevrolet Performance cooling system sealant tablets are a stop-leak product that dissolves in the coolant to seal small leaks. The package contains five 4-gram tablets.
Specifications:
- Cooling system sealant / stop-leak tablets
- 4 grams per tablet
- Set of 5 (20 grams total)
- Part number: 12378255
Applications:
- GM engine cooling systems
FAQ
What are tablets 12378255 used for?
They are a stop-leak product that seals small cooling system leaks.
How many tablets are included?
There are five 4-gram tablets, 20 grams total.
How are they used?
They dissolve in the coolant to seal small leaks.
What cooling systems are they for?
They are formulated for GM engine cooling systems.

