ID 4 to 5 inch(102-127mm) Straight Silicone Reducer Coupler

TuoLauthon’s 4 to 5 inch (102–127 mm) straight silicone reducer coupler is a heavy-duty, 4-ply reinforced silicone connection kit that adapts turbo, intake, intercooler, and exhaust piping with two included stainless steel T-bolt clamps.

This reducer coupler is engineered to provide a reliable, vibration-tolerant join between mismatched tubing diameters in automotive and industrial systems. Constructed from high-quality silicone with four layers of polyester reinforcement, the sleeve resists heat, ozone and UV exposure while maintaining flexibility across a wide temperature range. It ships ready to install with two corrosion-resistant T-bolt clamps sized to secure the 102 mm to 127 mm inner diameter transition.

What materials and build quality can I expect?

The coupler uses premium silicone elastomer reinforced by four polyester plies for strength and dimensional stability under pressure. This multi-layer design limits expansion and protects against tears while preserving pliability for tight-fit installations.

• 4-ply polyester reinforcement for pressure resistance and durability
• 5 mm wall thickness combining rigidity and flexibility
• High-grade silicone outer/inner surfaces for chemical and weather resistance
• Two stainless steel T-bolt clamps included for strong, even sealing

How does it perform under temperature and pressure?

The reducer is rated for extreme environments, capable of operating in very low and very high temperatures without stiffening or cracking. Operating pressures cover typical boost and intake conditions and offer a substantial safety margin before burst failure.

• Temperature range: -76°F (−60°C) to +500°F (+260°C)
• Working pressure range: 0.3 MPa (43.5 PSI) to 0.9 MPa (130.5 PSI)
• Bursting pressure up to 2 MPa for added reliability
• UV and ozone resistant for outdoor and marine use

Will this fit my piping and how is it measured?

This straight reducer accepts pipes with inner diameters of 102 mm (4 in) on the smaller end and 127 mm (5 in) on the larger end, with a short 76 mm (3 in) overall sleeve length. Measure the outside diameter of your tubing and the clamp range to confirm proper fit; the included T-bolt clamps provide a wide range of tightening adjustment.

• Inner diameters: 102 mm to 127 mm (4"–5")
• Sleeve length: 76 mm (approx. 3") for compact installations
• Wall thickness: 5 mm for robust sealing and support
• Includes two stainless T-bolt clamps to secure both ends

How easy is installation and what applications suit this coupler?

The short straight design and flexible silicone make it straightforward to install in tight engine bays or piping runs. It’s compatible with turbo intake plumbing, intercooler lines, exhaust transitions, marine exhaust systems, and other industrial ducting where a reliable, heat-resistant join is needed.

• Slip onto pipe ends and tighten T-bolts for an even, leak-resistant seal
• Ideal for turbochargers, intercoolers, intake manifolds, and exhaust adapters
• Works well in marine, industrial, and performance automotive environments
• Resists ozone, UV, oil splashes and temperature cycling

Who this is for: Technicians, DIY tuners and fabricators who need a durable, compact reducer to adapt 4" to 5" piping—particularly useful for turbo and intercooler plumbing, custom exhaust transitions, and marine or industrial ductwork. If you require a robust silicone coupling with wide temperature tolerance, reinforced strength and included corrosion-resistant clamps for a secure installation, this TuoLauthon reducer coupler meets those needs without additional modifications.