Straight Reducer Coupler Silicone Hose ID 3.5inch to 4inch

The Taukealugs straight reducer coupler is a heavy-duty 4-ply silicone hose that joins 3.5-inch to 4-inch turbo, intercooler, or intake piping and ships with two stainless steel T-bolt clamps.

This reinforced silicone coupler is built for high-temperature engine and forced-induction systems where a durable, flexible connection is required between mismatched pipe diameters. Its 3" (76mm) length, 5mm wall thickness and 4-ply construction balance strength and pliability, while the included stainless T-bolt clamps provide even clamp pressure for leak-resistant assemblies.

How does this reducer handle heat and pressure in turbo systems?

The coupler is made from high-temperature pure silicone and reinforced with four plies for improved burst and fatigue resistance. It tolerates a wide temperature range and resists softening or cracking under typical turbocharged operating conditions.

• Temperature range: -60°C to 230°C (-140°F to 428°F)
• Bursting pressure approximately 2 MPa for reliable performance
• 4-ply reinforcement reduces expansion and blowout risk
• 5mm wall thickness balances heat resistance with flexibility

Will it fit my 3.5" to 4" intake or intercooler piping?

The interior diameter transition covers pipes from 3.5 inches (89 mm) to 4 inches (102 mm), designed to create a snug transition between those common sizes. Its 3" overall length gives enough engagement depth for secure clamping without taking excessive space in tight engine bays.

• Coupler ID sizes: 3.5" to 4" (89–102 mm)
• Length: 3 inches (76 mm) for compact installations
• Compatible with intercooler, turbo outlet, charge pipe and intake plumbing
• Flexible enough to accommodate slight misalignment between pipes

What fastening hardware is included and why does it matter?

Two stainless steel T-bolt clamps are included to ensure consistent, high-clamp force around the coupler circumference. T-bolt clamps distribute pressure evenly and resist corrosion, reducing the chance of leaks or clamp failure compared with standard worm-gear clamps in high-pressure applications.

• Includes 2x stainless steel T-bolt clamps for uniform clamping
• Clamps are corrosion resistant for long-term use
• Better sealing and less deformation than typical screw clamps
• Designed for turbo and charge-air systems where pressurization fluctuates

Who is this for: The Taukealugs straight reducer is ideal for DIY tuners, professional shops, and performance enthusiasts who need a short, durable silicone transition between 3.5" and 4" piping. It works well in turbocharger plumbing, intercooler connections, and custom intake builds where reliable sealing, high-temperature stability, and compact length are required. Choose this coupler when you want a reinforced silicone joiner with stainless hardware that stands up to repeated thermal cycles and boost pressures.