Thermagasket Extreme Duty Head & Block Sealant

Thermagasket Extreme Duty Head & Block Sealant Large Capacity is a professional-grade engine repair solution specifically engineered for large-capacity gasoline and diesel engines with cooling systems exceeding 7 gallons.

This advanced two-part formula combines a 32 oz Extreme Duty Base Formula (Part A) with a 16 oz Catalyst (Part B) to create a powerful sealing system designed to repair and seal:

✓ Blown head gaskets
✓ Cracked cylinder heads
✓ Engine block leaks
✓ Coolant loss issues
✓ Internal coolant leaks
✓ Combustion gas leaks

Unlike temporary stop-leak products, Thermagasket Extreme Duty is formulated for demanding applications found in heavy-duty trucks, commercial vehicles, diesel pickups, industrial equipment, RVs, and large-displacement engines.

Key Features

• Designed for engines with 7-gallon cooling system capacity or larger

• Compatible with both gasoline and diesel engines

• Professional-strength two-part sealing technology

• Helps restore engine performance and cooling system integrity

• Ideal for heavy-duty, commercial, towing, and high-load applications

• Easy-to-follow application process

What's Included

• 32 oz Thermagasket Extreme Duty Formula (Part A)

• 16 oz Thermagasket Catalyst (Part B)

If you're searching for a reliable head gasket repair solution, engine block sealant, diesel head gasket sealer, or heavy-duty coolant leak repair, Thermagasket Extreme Duty delivers professional-grade performance for large-capacity engines.