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.
4 AWG / 4 Gauge Firewall Bushing
- 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
Warranty and Return Policy
Summary of Customer Ratings & Reviews
Kansas City, MO
September 15, 2011
56 of 66 found this helpful
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
Olive Branch, MS
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
November 4, 2011
Worked like a charm could be alittle stronger plastic but still a good product.
50 of 60 found this helpful
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
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
Saint Louis, MO
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.
0 of 0 found this helpful
Internal Product ID
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.