🔔 Sound the Alarm: Make Your Presence Known!
The Hadley Manufacturing H00977AD Air Horn is a high-performance sound signaling device designed specifically for Volvo vehicles. Weighing only 6 pounds and measuring 36 x 9 x 8 inches, this air horn is engineered for easy installation and compatibility with various Volvo part numbers. While it does not include a pedestal kit, it promises unmatched sound power and durability, ensuring you’re heard loud and clear on the road.
| Manufacturer | Hadley Manufacturing |
| Brand | Hadley |
| Item Weight | 6 pounds |
| Package Dimensions | 36 x 9 x 8 inches |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | H00977AD |
D**8
You will need to purchase an air fitting and mounting hardware!
Great quality, deep sounding horn. Perfect for what I need. However, it is just the horn. No mounting hardware or air fitting. This is the part number for the air fitting - H11477S. Should be able to find it on amazon for around $20. You can also find the pedestals/mounts on amazon.
A**R
Weird air inlet thread size
Be advised the air inlet threads are 7/16-24. Not a standard or common size in air fittings. The horns I removed from my Peterbilt 379 were also Hadley but they have the common 1/8”NPT inlet. I’m having a hard time finding the right fitting.Other than that they look and fit just like the Hadley horns I removed/replaced.
R**Y
Speedy delivery
Just as was ordered, speedy delivery, easy transaction.
M**G
The diaphragm/orifice in the throat is broken
Bought this April 2023 and installed it August 2024. Looks great on the outside, as a Hadley air horn should. Installed on our truck, pushed the steering wheel horn and pssssst…pssssst. No loud air horn sound, just air passing thru sound. Open the back panel and the throat diaphragm/orifice is broken. Looks like plastic?!? Now we have to buy another (going with another seller).
P**A
Five Stars
Sounds like the big Freightliners, worked out of the box, Great communications with Hadley
M**
The item needed parts to install it properly. Very disappointed and annoying
The item needed parts to install it properly. Very disappointed and annoying. I sent a email to the seller am d they beber answered
S**.
Nice horns with flaws
I’ve got three of these now.Good looking horns with great tone once you clean the excess adhesive out of the bells.But they’ve got the thinnest chrome that I’ve seen! They’ll pit in no time flat, and if you try to polish them you”ll be down to the copper underlay before you know it.I’ll powder coat mine and just give up on the chrome completely. Can’t properly rechrome them without taking the bells apart, and they’re glued together.
B**D
No hardware.
This did not come with hardware. Very disappointed.
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