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Daystar, Universal Firewall Boot, Single, Accommodates 3/8" to 1" Diameter Wire Bundles, fits any vehicle that needs a wire loom, KU20040BK, Made in America , Black

4.6 4.6 out of 5 stars 385 ratings
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Purchase options and add-ons

  • Safely and cleanly run wires through firewalls and bulkheads
  • Protects wires from sharp edges; prevents wire chaffing and shorts
  • Eliminates air/water leaks
  • Fits a variety of wire thicknesses and bundles from 3/8 inch to 1 inch; 1-1/4 inch hole required for installation
  • Works great for tubing and air lines
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Product Description

Daystar's Firewall Boot is the best way to run wires, hoses, and other lines through your vehicle's firewall. Simply drill a 1.25 inch diameter hole in the firewall and install the boot. Run your wires, trim the boot as necessary to one of three different sizes (3/8 inch, 11/16 inch, or 1 inch), and secure the assembly with a zip tie.

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Warranty & Support

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Daystar, Universal Firewall Boot, Single, Accommodates 3/8" to 1" Diameter Wire Bundles, fits any vehicle that needs a wire loom, KU20040BK, Made in America , Black


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Customer reviews

4.6 out of 5 stars
4.6 out of 5
385 global ratings

Customers say

Customers like the quality, performance, size and ease of installation of the auto accessory. They mention that it works well to make a safe and secure tunnel through the firewall, it fits perfectly and that it's adjustable. They also like the wires protection. However, some customers dislike the thickness.

AI-generated from the text of customer reviews

28 customers mention28 positive0 negative

Customers are satisfied with the quality of the auto accessory. For example, they say it's a high-quality piece that will last, it makes for a clean look when passing through the firewall, and it' s well-made.

"thick rubber, high quality product. was super easy to install!" Read more

"...The trim to fit makes it versatile, and the quality is tough enough where I didn't have to overly worry about tearing it while pulling it through..." Read more

"...High quality piece that will last." Read more

"...Awesome product." Read more

27 customers mention27 positive0 negative

Customers are satisfied with the performance of the auto accessory. They mention that it works well for their application, makes a safe and secure tunnel through the firewall, and is easy to install. Some customers also mention that the product is useful and easy to use.

"...from sharp edges; prevents wire chafing and shorts Works great for wires, tubing, and air lines Requires drilling a 1.25 inch diameter..." Read more

"...I can confirm it works great! Fits all the way up to the biggest part of the shaft.It does look goofy though." Read more

"Great product worked very well. Stuffed full of cables threw my firewall and no leake or any problems." Read more

"Works great for my 0/1 gauge wire to run through the fire wall. Add some shrink wrap, and you'll have a nice water tight seal" Read more

19 customers mention16 positive3 negative

Customers like the size of the auto accessory. For example, they mention it fits perfectly and also keeps wires from escaping. The adjustable size allows for different amounts of wires to be cinch down with a zip tie. Some mention that the product is not small and can handle multiple cable sizes.

"...WARNING this thing is not small as it can handle multiplecable sizes...." Read more

"...I can confirm it works great! Fits all the way up to the biggest part of the shaft.It does look goofy though." Read more

"...cap you can use to run wires to your battery from the cab, this fits perfectly and also keeps wires from rubbing on metal." Read more

"I finally got around to installing this boot and it fit like a glove!..." Read more

13 customers mention13 positive0 negative

Customers find the installation process of the auto accessory to be easy. They mention that it is flexible for most cab wiring installation, and easy to mount for running wires through bulk head.

"...after that its real easy to use. You don't..." Read more

"thick rubber, high quality product. was super easy to install!" Read more

"...This was a very easy install and needed no mods or drilling, just pop out the small plastic cover on the top driver side of firewall, install grommet..." Read more

"...It looked too easy so I gave it a try. Wow, what a simple install. Used a stepped drill bit and cut out a 1.25" hole...." Read more

4 customers mention4 positive0 negative

Customers are satisfied with the leakage of the auto accessory. They mention that the cables went through their firewall without any problems, and the Daystar made a tight seal and doesn't allow cold air in.

"...Stuffed full of cables threw my firewall and no leake or any problems." Read more

"...The Daystar made a tight seal and doesn't allow cold air in. I bought several extras to keep in my tool box in case it becomes unavailable." Read more

"...Does not leak at all." Read more

"A really great seal..." Read more

4 customers mention4 positive0 negative

Customers like the wires protection of the firewall boot. They say it fits perfectly and prevents wires from rubbing on metal and sharp edges.

"...inch, 11/16 inch, and 1 inch diameter wire bundles Protects wires from sharp edges; prevents wire chafing and shorts Works great for..." Read more

"...your battery from the cab, this fits perfectly and also keeps wires from rubbing on metal." Read more

"This firewall boot is perfect for protecting wires that you wish to run between your engine compartment and into the auto cabin...." Read more

"...firewall and it is very sturdy and flexible and will protect your wires from damage." Read more

3 customers mention3 positive0 negative

Customers like the cable. They say it's perfect for adding another cable through the firewall, and a great way to add additional wiring through the fire wall or as protection from wiring coming.

"Perfect for adding another cable through your fire wall...." Read more

"Great way to add additional wiring through the firewall or as protection from wiring coming in contact with any metal passthrough...." Read more

"...With this option it will allow you to add more cables later if needed." Read more

4 customers mention0 positive4 negative

Customers are not happy with the thickness of the auto accessory. They mention that it's thinner than expected and the centers are very thin.

"...Only four stars because, as others have mentioned, the thickness of this boot is not enoughfor years of extreme temperatures in engine well...." Read more

"Worked very well. Slightly thinner than I anticipated. Will have to see how it holds up through seasonal temperature changes." Read more

"This is not very thick and I think it tries to cover too many different diameters. It would be best to just use the correct size." Read more

"The centers are very thin and rear around the outer ......" Read more

Dog toy?
3 Stars
Dog toy?
Product was delivered sealed in a box and was sealed in a bag.....but the bigger of the ends looks like a dog chewed it to length,you think when you pay $15 there would be some kind of quality control to what your selling.....I'm sure item will still work and be hidden under the hood but sure doesn't look all nice look the pictures.
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Customer image
3.0 out of 5 stars Dog toy?
Reviewed in the United States on May 24, 2023
Product was delivered sealed in a box and was sealed in a bag.....but the bigger of the ends looks like a dog chewed it to length,you think when you pay $15 there would be some kind of quality control to what your selling.....I'm sure item will still work and be hidden under the hood but sure doesn't look all nice look the pictures.
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Customer image Customer image
Customer imageCustomer image

Top reviews from other countries

annonymous
5.0 out of 5 stars Great product
Reviewed in Canada on October 10, 2020
Randy
5.0 out of 5 stars Perfect fit
Reviewed in Canada on January 17, 2024
Ivan
5.0 out of 5 stars Great
Reviewed in Canada on January 28, 2021
Bruce
4.0 out of 5 stars Good product, just overpriced
Reviewed in Canada on April 9, 2019
Tim Colby
5.0 out of 5 stars Wrangler firewall
Reviewed in Canada on April 19, 2021