4 Or 5 Inch ID Flex Tubing - 409 Stainless Steel - 10 to 25 Feet

409 Stainless Steel Flex Pipe – Heavy Duty Exhaust Solution

Durable 409 Stainless Steel ConstructionBuilt to handle the toughest conditions, this heavy-duty flex pipe is made from premium 409 stainless steel, offering the perfect balance of strength, flexibility, and corrosion resistance. Designed specifically for Class 8 trucks and heavy-duty applications, it delivers long-lasting performance at a value price point.

Why Choose 409 Stainless?

• Excellent strength and heat resistance for diesel exhaust systems
• Naturally forms a protective oxide layer that slows corrosion
• Holds up to road salt, moisture, and high exhaust temperatures
• Ideal choice for fleets and operators who want reliable durability without the premium cost of 304 stainless

Performance Benefits

• Absorbs vibration and reduces stress on manifolds, turbos, and mufflers
• Allows for thermal expansion and contraction to prevent cracks or leaks
• Simplifies exhaust repairs and custom installs with flexible fitment
• Weld, clamp, or cut to size for fast installation

Features

• Made from 409 stainless steel for strength and corrosion resistance
• Shiny metallic finish with smooth corrugated construction
• Available in multiple lengths and diameters for semi-truck applications
• Built tough for highway, vocational, and severe-duty use

HD Truck Source 409 Stainless Steel Flex Pipe is the workhorse of exhaust repair and customization — strong, reliable, and engineered to keep your truck running with less downtime.