Granatelli Motor Sports HD 4.00 Inch Clamshell 318540CS

Granatelli Motor Sports Dual Seal HD 4.0 Inch Tubing Coupler Clamp

SKU: 318540CS

Heavy-Duty Quick-Release Clamshell Clamp for Extreme Turbo and High-Boost Applications

The Granatelli Motor Sports Dual Seal HD 4.0 Inch Tubing Coupler Clamp is built for extreme-performance applications where maximum airflow, boost retention, and reliability are non-negotiable. Precision-machined from T-6061 aluminum, this clamp is engineered to handle the demands of high-horsepower turbocharged and forced-induction systems while maintaining a clean, professional appearance.

Featuring Granatelli’s patented pin-and-ball quick-release clamping mechanism, this clamshell-style clamp provides a secure mechanical lock that resists vibration, heat cycling, and extreme boost pressure. Designed for 4.0-inch (102mm) tubing couplers, it delivers consistent, leak-free sealing in large-diameter intake and charge pipe systems.

Product Specifications

• Tubing Coupler Type: Straight
• Material: T-6061 Aluminum
• Finish: Black
• Inlet Diameter: 4.00 in. (102.00 mm)
• Outlet Diameter: 4.00 in. (102.00 mm)
• Quantity: Sold individually

Performance Features

• Dual-seal HD design for maximum boost retention and leak prevention
• Pin-and-ball quick-release system for fast installation and servicing
• Vibration-resistant under extreme boost and engine movement
• Maintains sealing integrity under high pressure and elevated temperatures
• Ideal for repeated disassembly without clamp fatigue or loss of clamping force

Included Components

• One heavy-duty outer clamp assembly
• One ball/pin safety retention pin

Designed for professional fabricators, racers, and serious performance enthusiasts, the Granatelli Motor Sports Dual Seal HD 4.0 Inch Clamshell Clamp is the ideal solution for large-frame turbo systems, high-boost charge piping, intercooler connections, and extreme horsepower builds. When airflow, strength, and serviceability matter most, Granatelli Motor Sports delivers proven performance.