3.00" to 4.00" Silicone Reducer Hose 3-Ply Black/Red
K2 Industries
3.00" to 4.00" Silicone Reducer Hose 3-Ply Black/Red
Check fitment before ordering
Match the year, make, model, trim and engine in the product details. Review mounting requirements and vehicle modifications. Ask us about this part.
3.00" to 4.00" Silicone Reducer Hose — 3-Ply Black/Red
Tapered silicone hose steps down from 3-inch to 4-inch diameter in one smooth transition. Built with 3-ply reinforced construction for boost lines, coolant routing, and vacuum applications. Black exterior with red inner core for visibility and durability under heat and pressure.
Key Features
- Tapered design - Connects mismatched hose diameters without adapters or couplers
- Silicone material - Handles boost pressure, coolant, and vacuum duty reliably
- 3-ply reinforcement - Inner fabric layers resist collapse and bursting under load
Specs
- Material: Silicone with 3-ply reinforcement
- Diameter: 3.00" to 4.00" reducer
- Color: Black exterior, red interior
Whats Included
- One silicone reducer hose (3.00" to 4.00")
Frequently Asked Questions
Do I need clamps, and what size should I use?
Clamps aren't included — you'll need hose clamps to secure both ends. Use clamp sizes appropriate for your 3-inch and 4-inch connections; stainless steel clamps are ideal for durability.
Can I use this for coolant, boost, or vacuum lines?
Yes. Silicone handles all three, including boost pressure and vacuum draw. Confirm your system's pressure rating matches silicone's capability on your specific application before installation.
Will this hose fit my existing connections without modification?
The taper is designed to connect 3-inch and 4-inch ports directly. Test-fit it in place before ordering clamps to confirm both ends seat properly on your fittings.
Your vehicle
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Manufacturer & part identification
K2 Industries
| Option | SKU / part reference |
|---|---|
| Standard | K2-1378-UNV-006-TSARK |
Vehicle compatibility
Read the application years, model, trim, engine and exclusions in the description above. A make-level collection or product recommendation alone does not confirm fitment.
Request fitment help →Installation & specifications
Review the manufacturer’s specifications and installation notes above. Confirm required mounting hardware, tools and modifications before ordering. If instructions are not supplied, contact us with the part reference.
Shipping expectations
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Shipping & delivery informationManufacturer warranty
Coverage and exclusions vary by manufacturer and part. Review the supplied product documentation or ask us for the applicable terms.
Warranty information