Mishimoto Silicone 45 Degree Reducer Coupler 3.5in-4in Red

Silicone 45-degree reducer coupler — the Mishimoto Silicone 45 Degree Reducer Coupler 3.5in-4in Red provides a reliable transition between 3.5" and 4" piping, enabling consistent air or coolant routing for improved system packaging and installation flexibility.

This 45-degree transition coupler is designed for use in both coolant and air passage systems, making it a practical choice when adapting different-diameter lines in confined or angled spaces. As part of the Mishimoto lineup, it benefits from the brand’s focus on application-specific silicone components and motorsports-grade development.

• 45-degree reducer geometry — facilitates smooth directional changes between mismatched diameters without requiring complex hard-pipe bends or custom fabrication.
• 3.5in to 4in sizing — provides a direct, engineered junction for common turbo, intercooler, intake, or coolant hose runs where a stepped transition is required.
• Dual-use compatibility — specified for both coolant and air passage systems, supporting integration across charge-air plumbing or coolant rerouting applications.
• Mishimoto engineering — produced as part of Mishimoto’s silicone coupler range, reflecting consistent dimensional control and application-focused fitment options.

Why this matters: a purpose-made reducer coupler reduces installation time, eliminates improvised solutions, and preserves flow paths across transitions. Using a dedicated 45-degree coupler simplifies routing for turbo upgrade plumbing, high-flow intake assemblies, or coolant system modifications while maintaining a neat, professional installation.

Applications and performance notes

• System routing — ideal when a compact angled transition is required between different-diameter hoses or pipes.
• Installation — designed to integrate with typical hose clamps and OEM-style hose ends used in aftermarket performance and maintenance work.
• Brand reliability — Mishimoto’s product family focuses on durable silicone solutions tailored to automotive performance and repair environments.

If you require a specific fitment or need additional dimensional data, refer to the Mishimoto product resources or contact the supplier for exact measurements and clamp recommendations.