Thermagasket Extreme Duty Head & Block Sealant
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Estimated Delivery:Jul 08 - Jul 12
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Free Shipping & Returns: On all orders over $75
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
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Designed for engines with 7-gallon cooling system capacity or larger
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Compatible with both gasoline and diesel engines
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Professional-strength two-part sealing technology
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Helps restore engine performance and cooling system integrity
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Ideal for heavy-duty, commercial, towing, and high-load applications
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Easy-to-follow application process
What's Included
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32 oz Thermagasket Extreme Duty Formula (Part A)
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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.
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We want you to be 100% satisfied with your purchase. Items can be returned or exchanged within 30 days of delivery.
Discover more in our FAQ
How long does it take to process an order?
All the details you love about the original—with a fresh flared block heel and modern square toe. Expertly crafted using soft Nappa leather, this essential style molds and moves with you to keep you comfortably on your feet all day (and night). This boot uses leather sourced from a Leather Working Group-approved trader. The Leather Working Group (LWG) Audit Standards provide transparency and accountability within the leather supply chain—covering energy and water usage.
Do you ship internationally?
All the details you love about the original—with a fresh flared block heel and modern square toe. Expertly crafted using soft Nappa leather, this essential style molds and moves with you to keep you comfortably on your feet all day (and night). This boot uses leather sourced from a Leather Working Group-approved trader. The Leather Working Group (LWG) Audit Standards provide transparency and accountability within the leather supply chain—covering energy and water usage.
What is your return policy?
All the details you love about the original—with a fresh flared block heel and modern square toe. Expertly crafted using soft Nappa leather, this essential style molds and moves with you to keep you comfortably on your feet all day (and night). This boot uses leather sourced from a Leather Working Group-approved trader. The Leather Working Group (LWG) Audit Standards provide transparency and accountability within the leather supply chain—covering energy and water usage.
What are your sizing options?
All the details you love about the original—with a fresh flared block heel and modern square toe. Expertly crafted using soft Nappa leather, this essential style molds and moves with you to keep you comfortably on your feet all day (and night). This boot uses leather sourced from a Leather Working Group-approved trader. The Leather Working Group (LWG) Audit Standards provide transparency and accountability within the leather supply chain—covering energy and water usage.