3in Straight Hose Couplers

Three inch piping is the most common size on turbo and intercooler builds, and this collection gathers the Vibrant Performance straight silicone couplers in 3.00 inch inside diameter, plus a few neighboring sizes, in black, blue and red.

Why 3 inch

Three inch charge pipes flow enough air for most street and strip turbo builds without hurting throttle response, so most intercooler kits and many turbo outlets use this size. A good stock of 3 inch couplers covers most joints on these cars.

Lengths and colors

Short couplers join two pipes with a tight gap, and longer ones bridge bigger gaps or allow more engine movement. Black disappears under the hood, while blue and red add color.

Fitting tips

A 3.00 inch I.D. coupler fits 3 inch O.D. tubing. Leave at least an inch of engagement per side, bead the pipe ends and use T-bolt clamps on boosted joints.

Common questions

Will a 3 inch coupler fit 76mm pipe? Yes. 76mm is about 2.99 inches, so a 3 inch coupler fits.

Can I use these for coolant? Yes. Silicone works well for coolant. It is not for oil or fuel.

Are these reinforced? Yes. They are multi-ply reinforced for boost and heat.

What's in This Collection

  • 32 products from Vibrant Performance, priced from $8.99 to $37.75
  • Sizes from 1" to 6"
  • Finishes: Black, Blue and Red
  • Free shipping on orders over $150

How to Choose

Measure the outside diameter of the pipes you are joining and choose a coupler with a matching inside diameter. Straight couplers join two pipes in line, elbows turn the path, hump hoses absorb engine movement and reducers join two different sizes. Reinforced silicone holds its shape under boost and heat where rubber hose would balloon or crack.

More Questions

What clamps should I use with silicone couplers?

T-bolt clamps give the most even clamping force and are the best choice on boosted joints. Bead the pipe ends so the coupler cannot blow off.

Can silicone couplers be used on coolant lines?

Silicone works well with coolant, but check the inside diameter and temperature needs for your application.

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