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Port Tube

4" diameter, 4-1/2" long

Item #: 125M1703

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2 Reviews | Ask Questions

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Building your own subwoofer enclosure? This port tube features a rolled flange to ensure a clean fit on the outside of your box. The tube's ABS plastic construction features markings that make it easy for you to trim the tube to the proper length for your driver and box combination.

Product Highlights:

  • ABS plastic port tube for subwoofer box construction
  • rolled front flange for secure mounting
  • internal diameter: 3-15/16", external diameter: 4-1/8"
  • depth: 4-1/2"
  • warranty: 60 days
  • Our 60-day money-back guarantee

Port Tube Reviews

Average Customer Review:

2 Reviews


Written by: Anonymous from Haubstadt, IN on November 23, 2014

Crutchfield Customer Review (What's this?)

Perfect fit for 4" schedule 40 thick wall PVC. Makes box look Great!!

Pros: Easy to order and fast shipping.

Cons: None


Written by: s420 from topeka, ks on October 21, 2013

Crutchfield Customer Review (What's this?)

Very good product, solid construction, very easy to use, I definitely recommend this for anyone building a sub box with a round port.

Pros: Good solid quality, easy to use

Cons: It could be a little longer

Hands-on research

What's in the box?

  • One 4" Dia x 4.5" flanged port tube

Product Research


Overview: This is a plastic port tube used for ported enclosures for subwoofers.


  • Cutout Diameter: 4.15"
  • Interior Diameter: 3.95"
  • Outer Flange Diameter: 4.79"
  • Length: 4.51"

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A