The Turbosmart 2.25" to 2.75" Straight Silicone Reducer Coupler – Black (TS-HR225275-BK) is a high-performance silicone hose designed to connect intake, intercooler, and turbocharger piping with different diameters. Featuring a 2.25-inch (57mm) inside diameter on one end and a 2.75-inch (70mm) inside diameter on the other, this reinforced silicone reducer provides a secure, flexible transition between compatible piping components.

Manufactured from high-quality, multi-layer reinforced silicone, the TS-HR225275-BK is engineered to withstand the elevated temperatures and pressure fluctuations commonly encountered in performance forced-induction systems. Its four-ply construction and 5mm wall thickness provide excellent durability while retaining the flexibility needed to accommodate engine movement and vibration.

Turbosmart rates this silicone reducer for continuous temperatures ranging from -50°C to 170°C (-60°F to 340°F) and pressures up to 220 PSI, making it suitable for properly installed performance intake and charge piping applications.

With an overall length of 100mm, the reducer provides a compact solution for transitioning between differently sized piping sections without requiring additional adapters or custom fabrication.

Whether installing a larger intercooler, upgrading turbocharger piping, or fabricating a custom forced-induction system for a Honda K20/K24, the Turbosmart TS-HR225275-BK delivers dependable construction, precise sizing, and a clean black finish.

Features

• Genuine Turbosmart Silicone Reducer: Designed for performance intake and turbocharger piping applications.

• 2.25" to 2.75" Diameter Transition: Connects compatible piping with different outside diameters.

• Four-Ply Reinforced Silicone: Provides strength and durability under demanding operating conditions.

• 5mm Wall Thickness: Helps resist deformation and damage.

• 100mm Overall Length: Compact design for custom piping installations.

• 220 PSI Pressure Rating: Manufacturer-rated hose pressure capability.

• High-Temperature Resistance: Rated for continuous temperatures up to 170°C (340°F).

• Low-Temperature Resistance: Rated for temperatures down to -50°C (-60°F).

• Straight Reducer Design: Provides a smooth transition between two different pipe sizes.

• Black Finish: Offers a clean, understated appearance.

• Flexible Construction: Accommodates minor movement and vibration between connected components.

• Intercooler Piping Compatibility: Suitable for correctly sized charge piping connections.

• Turbocharger Plumbing: Ideal for custom turbocharger compressor and intercooler piping.

• Intake System Applications: Can be used for compatible air intake connections.

• Universal Fitment: Selected by piping diameter rather than vehicle make or model.

• Turbosmart Part Number TS-HR225275-BK: Ensures accurate product identification.

Popular Performance Applications

The Turbosmart TS-HR225275-BK is a universal silicone reducer intended for applications requiring a transition between 2.25-inch and 2.75-inch outside-diameter piping.

Popular applications include:

• Honda Civic K20 Turbo Builds: Custom intercooler and charge piping connections.

• Honda Civic K24 Turbo Builds: Turbocharger piping transitions on K24A and K24A2 applications.

• Acura RSX Type-S Turbo Builds: Aftermarket K20 turbocharger installations.

• Acura TSX K24 Turbo Applications: Custom intercooler and intake piping.

• Honda Accord K-Series Turbo Builds: Charge piping fabrication and upgrades.

• Honda S2000 Turbo Builds: Custom F20C and F22C intercooler plumbing.

• Acura Integra Turbo Builds: B-Series and K-Series forced-induction systems.

• Honda Prelude Turbo Builds: Custom turbocharger intake and charge piping.

• K20/K24 Frankenstein Turbo Builds: Performance intercooler piping configurations.

• B16, B18, and B20 Turbo Builds: Custom piping transitions.

• Subaru WRX and STI Turbo Builds: Compatible aftermarket charge piping installations.

• Mitsubishi Evolution Turbo Builds: Custom intercooler plumbing.

• Nissan SR20DET and RB-Series Turbo Builds: Aftermarket intake and charge piping.

• Toyota 1JZ and 2JZ Turbo Builds: Performance turbocharger piping systems.

• Drag Racing Applications: Reinforced silicone connections for custom piping.

• Roll Racing Applications: High-performance forced-induction plumbing.

• Track and Motorsport Vehicles: Intake and intercooler piping fabrication.

Important: This is a universal silicone reducer, not a vehicle-specific direct-fit component. Both piping diameters and available installation space must be verified before ordering.

Additional Information

• Manufacturer: Turbosmart
• Part Number: TS-HR225275-BK
• Product Name: Straight Silicone Hose Reducer 2.25" to 2.75" – Black
• Product Type: Silicone Reducer Coupler
• Smaller Inside Diameter: 2.25 Inches (57.1mm)
• Larger Inside Diameter: 2.75 Inches (69.9mm)
• Overall Length: 100mm (Approximately 3.94 Inches)
• Straight Section Length: 37mm
• Tapered Transition Length: 25mm
• Wall Thickness: 5mm
• Reinforcement: Four-Ply
• Material: Multi-Layer Reinforced Silicone
• Color: Black
• Maximum Rated Pressure: 220 PSI
• Temperature Range: -50°C to 170°C
• Temperature Range (Fahrenheit): Approximately -60°F to 340°F
• Connection Style: Straight Diameter Reducer
• Primary Application: Intake, Intercooler, and Turbocharger Charge Piping
• Vehicle Fitment: Universal, Based on Piping Dimensions
• Quantity: One Reducer Coupler
• UPC: 9329677011753

2.25" to 2.75" Diameter Transition

The TS-HR225275-BK features two different inside diameters:

• Small End: 2.25 inches (57.1mm).

• Large End: 2.75 inches (69.9mm).

This configuration allows two sections of differently sized piping to be connected without welding a transition into the piping.

The reducer is designed to fit over tubing with matching outside diameters.

Important: Always measure the outside diameter of both pipes before ordering.

100mm Overall Length

The reducer measures 100mm, or approximately 3.94 inches, in overall length.

Its design includes a 37mm straight section and a 25mm tapered transition section, as identified in Turbosmart's published dimensional specifications.

This configuration provides room for connecting different pipe sizes while maintaining a relatively compact overall length.

When planning an installation, verify that sufficient straight pipe engagement is available for proper clamping.

Four-Ply Reinforced Silicone Construction

The TS-HR225275-BK features four-ply reinforced silicone construction.

Multiple reinforcement layers help provide structural strength and dimensional stability when exposed to pressure and temperature changes.

This construction is especially beneficial in turbocharged applications where intake and charge piping connections experience repeated pressure cycles.

The reinforced design also helps resist deformation compared with many conventional unreinforced rubber connectors.

5mm Wall Thickness

The reducer incorporates a 5mm wall thickness.

This provides additional material strength while maintaining the flexibility necessary for installation between rigid piping sections.

The wall thickness also helps the coupler withstand vibration and movement when properly secured.

220 PSI Pressure Rating

Turbosmart rates its silicone reducer hoses for pressures up to 220 PSI.

This is the manufacturer's hose rating and does not guarantee that a complete piping connection will safely withstand that pressure.

Actual connection performance depends on several factors, including:

• Piping diameter and surface condition.

• Proper pipe-end retaining beads.

• Hose clamp selection.

• Clamp installation and tightening.

• Operating temperature.

• Piping alignment.

• Hose condition.

For pressurized turbocharger systems, properly sized clamps and adequate pipe-end retention are essential.

High-Temperature Silicone Material

The TS-HR225275-BK is designed for continuous operating temperatures between -50°C and 170°C.

Its reinforced silicone construction provides resistance to the elevated temperatures commonly encountered in performance engine bays.

This makes the reducer suitable for many intake and intercooler piping applications.

However, it should not be installed in direct contact with turbocharger turbine housings, exhaust manifolds, or other surfaces that exceed its rated temperature range.

Straight Reducer vs. Straight Coupler

A straight silicone coupler connects two pipes of the same diameter.

A silicone reducer connects two pipes of different diameters.

The TS-HR225275-BK is designed specifically to transition from 2.25-inch piping to 2.75-inch piping.

For applications using equal-diameter tubing, a straight silicone coupler should be selected instead.

Black Silicone Finish

The black finish provides a clean, factory-inspired appearance that complements a wide range of performance engine bay configurations.

It pairs well with:

• Black aluminum intercooler piping.

• Polished aluminum charge piping.

• Stainless steel turbocharger piping.

• Aftermarket intercoolers.

• Custom intake systems.

• Performance turbocharger installations.

Silicone vs. Conventional Rubber Couplers

Reinforced silicone couplers offer several advantages over many conventional rubber connections in demanding air piping applications.

These include:

• Greater resistance to elevated temperatures.

• Improved resistance to hardening and cracking.

• Reinforced construction for pressurized systems.

• Flexibility during installation.

• Long-lasting performance when properly installed.

Actual service life depends on the operating environment and installation quality.

Recommended Hose Clamps

The TS-HR225275-BK should be secured using properly sized clamps suitable for the application.

For turbocharger charge piping, high-quality T-bolt clamps are commonly used.

Because the reducer has different diameters at each end, the required clamp sizes will also differ.

The clamp selection must account for the hose's outside diameter, including its 5mm wall thickness.

Important: Hose clamps are not included and must be purchased separately.

Oil and Chemical Compatibility

Standard silicone reducers are primarily intended for air and charge piping applications.

They are not designed for continuous exposure to fuel, engine oil, or other petroleum-based liquids unless specifically approved for that use.

Applications involving significant oil contamination may require a specially lined hose.

Verify material compatibility before using this reducer in a fluid-handling application.

Common Reasons for Replacement

• Intercooler Piping Size Changes: Connects 2.25-inch piping to 2.75-inch piping.

• Turbocharger Upgrades: Accommodates different compressor outlet and charge pipe diameters.

• Custom Intercooler Installations: Provides a flexible transition between differently sized piping.

• Damaged Silicone Couplers: Replaces torn, cracked, or deteriorated connectors.

• Boost Leak Repairs: Replaces leaking couplers when the hose is the source of the leak.

• Custom Intake Fabrication: Provides a reducer connection for compatible intake tubing.

• Piping Modifications: Supports changes to turbocharger or intercooler routing.

• Aging Rubber Connections: Upgrades suitable conventional rubber couplers.

• High-Temperature Applications: Provides a reinforced silicone connection within its rated operating range.

• Engine Bay Appearance: Adds a clean black finish to custom piping.

• Performance Engine Builds: Supports custom forced-induction plumbing.

• Preventative Maintenance: Replaces worn connections before they fail.

Installation Notes

1. Verify Both Pipe Diameters: Confirm that one pipe measures 2.25 inches outside diameter and the other measures 2.75 inches.

2. Measure Available Space: Ensure the installation accommodates the 100mm overall length.

3. Allow the Engine to Cool: Avoid working around hot turbocharger and exhaust components.

4. Remove the Existing Coupler: Loosen the clamps and carefully remove the original connector.

5. Inspect the Piping: Check for damaged pipe ends, sharp edges, or missing retaining beads.

6. Clean the Pipe Ends: Remove dirt, oil, and debris from the mating surfaces.

7. Inspect the New Reducer: Verify that the silicone is free of cuts or damage.

8. Select Appropriate Clamps: Use the correct clamp size for each end of the reducer.

9. Position the Clamps: Install the clamps before fitting the reducer.

10. Install the Smaller End: Slide the 2.25-inch end over the corresponding pipe.

11. Install the Larger End: Slide the 2.75-inch end over the matching pipe.

12. Verify Pipe Engagement: Ensure sufficient overlap on both sides.

13. Check Reducer Alignment: Avoid twisting, stretching, or excessively bending the hose.

14. Position the Clamps Correctly: Place each clamp behind the corresponding pipe retaining bead.

15. Tighten the Clamps: Follow the clamp manufacturer's recommended tightening procedure.

16. Avoid Overtightening: Excessive clamp force can damage the silicone.

17. Inspect Clearance: Keep the reducer away from sharp edges, moving components, and excessive exhaust heat.

18. Perform a Boost Leak Test: Pressure-test the assembled piping at an appropriate test pressure.

19. Check for Movement: Verify that the reducer remains securely positioned.

20. Perform Controlled Initial Testing: Monitor the system for leaks or unexpected pressure loss.

21. Reinspect After Installation: Check the reducer and clamp security after initial operation.

Important: Proper clamp selection, pipe-end retention, and installation are essential for preventing silicone coupler separation under boost pressure.

What's Included

• (1) Turbosmart 2.25" to 2.75" Straight Silicone Reducer Coupler – Black (TS-HR225275-BK)

Note: This listing includes one silicone reducer coupler only. Hose clamps, piping, intercooler components, and other installation accessories are not included.

Complete your custom intake or intercooler piping installation with the Turbosmart 2.25" to 2.75" Straight Silicone Reducer Coupler – Black (TS-HR225275-BK).

Featuring four-ply reinforced silicone construction, a 5mm wall thickness, 100mm overall length, 220 PSI manufacturer pressure rating, and temperature resistance from -50°C to 170°C, this high-performance reducer provides a durable and flexible connection between differently sized piping sections.

Whether upgrading an intercooler, fabricating custom charge piping, or completing a turbocharged Honda K20/K24 build, the Turbosmart TS-HR225275-BK delivers dependable construction, accurate sizing, and genuine Turbosmart quality.