Description
The Mishimoto MMCP-R45-30375BK is a black 45-degree silicone transition coupler built from four layers of silicone, each separated by heat-resistant embedded fibers, giving it the durability to handle demanding coolant and air passage routing in tight engine bays. With an End 1 outside diameter of 3.2 inches and an End 2 outside diameter of 3.95 inches (3.75 inches inside diameter), this coupler is engineered to step down or transition between differently sized pipes at a 45-degree bend.
Whether you’re plumbing coolant lines or routing an air intake system, this Mishimoto silicone coupler is designed to make complex piping layouts manageable. Its four-ply silicone construction with embedded heat-resistant fibers is rated for temperatures up to 330°F, and the high pressure tolerance makes it well suited for intercooler pipe connections that see substantial boost. Because it’s coolant compatible and built for both air and coolant systems, this transition coupler gives builders flexibility whether they’re reworking intercooler piping, custom coolant routing, or other air intake and pressure-fed plumbing that calls for a reliable 45-degree bend.
Vehicle Applications
This is a universal-fit 45-degree transition coupler, not tied to a specific make, model, or year. It’s intended for custom fabrication and piping projects where a builder needs a 3.2-inch to 3.95-inch (3.75-inch ID) 45-degree silicone transition for coolant lines, intercooler piping, or other air passage routing rather than a direct factory-replacement fitment.
Features
- Allows for easy routing of complex coolant or intercooler pipes
- 100-percent silicone construction
- Constructed from four layers of silicone with embedded heat-resistant fibers
- Rated for temperatures up to 330°F
- High pressure tolerance is ideal for use on intercooler pipe connections
- Applicable for both coolant and air systems
- Available in black, blue, or red to match any engine bay
- Backed by the Mishimoto Lifetime Warranty
Specifications
- Brand: Mishimoto
- Part Number: MMCP-R45-30375BK
- Material: Silicone (four-layer construction with embedded heat-resistant fibers)
- Color: Black
- Coupler Style: 45-Degree Transition / Transition Elbow
- Maximum Temperature Rating: 330°F
- End 1 Outside Diameter: 3.2 IN
- End 2 Outside Diameter: 3.95 IN
- End 2 Inside Diameter: 3.75 IN
- Coolant Compatible: Yes
- Hose Clamps Included: No
- Purchase Includes: (1) Mishimoto 45-Degree Transition Coupler with Mishimoto Lifetime Warranty
Frequently Asked Questions
What is the maximum temperature this coupler can handle?
The Mishimoto MMCP-R45-30375BK is rated for temperatures up to 330°F.
Is this coupler compatible with coolant systems?
Yes, it is coolant compatible and applicable for use in both coolant and air passage systems.
Are hose clamps included with this coupler?
No, hose clamps are not included.
What is this coupler made of?
It is constructed from four layers of silicone, each divided by a layer of heat-resistant embedded fibers.
What are the diameters of this transition coupler?
End 1 has a 3.2-inch outside diameter, while End 2 has a 3.95-inch outside diameter and a 3.75-inch inside diameter.
What colors does this coupler come in?
This 45-degree transition coupler is available in black, blue, or red.
⚠ WARNING (California Proposition 65): This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
