This is the best grommet I have ever worked with. Seals up and locks down so the wire can not be pulled either way. Cost reflects the build quailty and performance. I have used this not only in automotive applications but also in marine applications which says alot for the performance.
StreetWires FB4
4 AWG / 4 Gauge Firewall Bushing
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- 4 Gauge Firewall Bushing
- Water tight seal when power wires pass through metal
- Locks securely as bushing is tightened
- Authorized Internet Dealer
- 1-year Manufacturer's warranty
Firewall Bushing Features
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
4 AWG
Warranty and Return Policy
Parts Warranty Duration
Not warranted
Labor Warranty Duration
Not warranted
Warranty Provider
Sonic Electronix
Summary of Customer Ratings & Reviews
Kyle
Kansas City, MO
Best grommet out there
September 15, 2011
56 of 66 found this helpful
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burning_soul07
Omaha, NE
Good Product
October 21, 2011
This is great for going thru the firewall. Keeps the wire safe and secure from grounding out.
55 of 66 found this helpful
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Kevin
Olive Branch, MS
Great Product
September 8, 2009
This will allow you to go through the firewall without having to worry about grommets or the metal cutting the wire. Great Idea for a product!
56 of 69 found this helpful
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MATT
STAFFORD, VA
GOOD PRODUCT
November 4, 2011
Worked like a charm could be alittle stronger plastic but still a good product.
50 of 60 found this helpful
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-Benjamin
Hampton, VA
Could be nice to use
July 22, 2012
I didn't use it. I bought my car used and the guy before me ran a system. I found the hole he used and it already had a rubber gasket type thing.
This could be very nice to have in some installation scenarios, like a complete rebuild.
Just know that you don't want your power wire chaffing on the firewall.
49 of 60 found this helpful
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Dr. B
Moyock, NC
Outstanding Product
July 28, 2013
This feed through firewall bushing is a great product. I used it when I ran my power amp wiring through the firewall. Great protection, excellent size and very convenient. I definitely feel more comfortable knowing the wires are protected. I definitely recommend this to anyone routing a cable through a metal firewall.
46 of 57 found this helpful
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4budz
Saint Louis, MO
Verified Purchase
StreetWires FB4
April 2, 2017
Nice design to guide and waterproof the wire through the firewall. Tighten snug, not necessary to over tighten to waterproof. May need a helper.
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Browse 2 questions and 5 answers
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Why did you choose this?
Sonic Electronix Store
ive used the 1/0 awg version of this to install a second battery and amp in the trunk and this thing works really well for getting wire through the firewall. the only down side is depending on your vehicle it may be rather difficult to get a drill down to a location that would work on the firewall to drill the rather large hole for this thing.
JD T on Dec 4, 2015
Needed it for a better grounding point on my truck (Frame)
Raymond M on Mar 28, 2015
How does this work? Does it clamp to the wire then rest on the metal? What size hole do you need, can it work with different sizes? How does it install on the wire?
Best Answer: The firewall bushing is designed to allow wiring and other tubular shaped items to pass through a solid thin wall structure insulating the wire or tube from ground out, abrasions, and cuts. Mainly the FB4 was designed for Audio electrical wire such as 4GA. It seems to be made from a soft plastic type material or mixture with glass filled nylon.
When you look at the photo, there is a rounded cap end on the right, and a cap hex on the left.
To Use:
Drill the appropriate size hole for the pass through bushing you are using. I would measure the hex threaded end on the left. Unthread the plastic hex and remove seal. Drill a hole in your firewall only the size of the threaded portion of the firewall bushing.
Once the hole is drilled - Paint or prime the steel to prevent rust/corrosion.
insert the seal back onto the firewall bushing, and then place in hole of firewall. The plastic thin threaded "Nut" will thread on the back side of the firewall holding it in place (In the inside of the vehicle). Try not to over-tighten - it is plastic.
The curved portion (right side of the bushing) will have a large cap that un-threads. This is a compression style connection. Un-thread the curved cap and slide your wire in and feed wire through the firewall bushing, then tighten rounded cap down. Inside, there is a rubber gasket that will compress down onto the wire as you tighten. Your wire should stay in place and not slide in and out.
The goal of the firewall bushing is to make sure you have a secure and water tight seal.
The FB4 was a bit sloppy with 4GA wire, but appears to seal fine on my application.
This will not work if you have a bundle of separate wires.
When you look at the photo, there is a rounded cap end on the right, and a cap hex on the left.
To Use:
Drill the appropriate size hole for the pass through bushing you are using. I would measure the hex threaded end on the left. Unthread the plastic hex and remove seal. Drill a hole in your firewall only the size of the threaded portion of the firewall bushing.
Once the hole is drilled - Paint or prime the steel to prevent rust/corrosion.
insert the seal back onto the firewall bushing, and then place in hole of firewall. The plastic thin threaded "Nut" will thread on the back side of the firewall holding it in place (In the inside of the vehicle). Try not to over-tighten - it is plastic.
The curved portion (right side of the bushing) will have a large cap that un-threads. This is a compression style connection. Un-thread the curved cap and slide your wire in and feed wire through the firewall bushing, then tighten rounded cap down. Inside, there is a rubber gasket that will compress down onto the wire as you tighten. Your wire should stay in place and not slide in and out.
The goal of the firewall bushing is to make sure you have a secure and water tight seal.
The FB4 was a bit sloppy with 4GA wire, but appears to seal fine on my application.
This will not work if you have a bundle of separate wires.
Product Summary
Manufacturer
Model Number
FB4
UPC
715442151301
Weight
0.25lbs
Internal SKU
fb4
Internal Product ID
15905
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Customer Testimonial
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This was my third order from Sonic Electronix. This is the best place in the world to purchase anything electronic. Amazing deals, instant shipping, and a huge selection to top it all off. Excellent company. Keep up the great work!____
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- Jarrod
from Cloverdale, CA
See more...Wiring Diagram Legend
Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.
Product Name: StreetWires FB4
