- +Complete 12V system under one part number: horn, solenoid, compressor and 5.5 L tank
- +Built-in 80/110 PSI auto on/off switching, so no separate pressure switch is needed
- +Full-size 3-trumpet 46129 horn with a higher 145 dB class rating than the mini bundle
- +Modest 12 A compressor current draw
- +Horn, air kit and replacement diaphragm are all sold separately
- −145 dB rating has a ±10 dB tolerance and no disclosed test distance
- −$499–$512 price is more than three times the horn-only 46129
- −Only a 6-month warranty, void if the horn is mounted upside down or under the truck
- −No published compressor duty cycle, airflow or chord frequencies
- −Air line and brass fittings not included; dealer dimensions conflict
Methodology
Last reviewed: November 8, 2026. This review aggregates publicly available information from manufacturer specifications, retailer listings, and verified user reviews. We do not perform hands-on testing. For the United Pacific 46170 we relied on United Pacific’s own product page for the bundle (captured as a spec sheet by a dealer), dealer listings from Big Rig Chrome Shop and Empire Chrome Shop, and the published specs of the bundle’s horn component (46129), plus one sound-demo video and one owner forum thread. Every number below traces to a source in the Sources section at the bottom.
Quick verdict
The United Pacific 46170 Standard Duty Train Horn Bundle pairs two catalog parts: the 46129 chrome 3-trumpet train horn and the 46140 heavy-duty 12V compressor with a 5.5-liter tank. That makes it a complete system under one part number, with auto on/off pressure switching built in. In our editorial view, the problem is price and paperwork. At roughly $499–$512 it costs well over three times what the horn alone sells for. The headline 145 dB rating has a ±10 dB tolerance and no test distance. The warranty is six months. Our editorial rating: 3.1/5. It suits a truck owner who already buys from United Pacific dealers and wants one SKU instead of a pile of parts. Most other buyers will find better-documented kits at this price.
What it is
United Pacific’s own product page describes the 46170 as a “Chrome 3 Trumpet Train Horn (UP Item # 46129) with Heavy Duty Air Compressor and 5.5 Liter Air Tank (UP Item # 46140)”. The kit includes “1 Train Horn” and “1 Turbo Air Compressor and 5.5 Liter Tank System.” The fitment table reads simply “Universal,” and the copy opens with a pitch about trucking safety. United Pacific’s truck division sells chrome and accessories mainly to semi-truck owners, and this bundle follows that focus.
The “Standard Duty” in the name is United Pacific’s tier label. The 46129 horn sits in the brand’s standard (sometimes called “economy”) line, below the Competition Series 46151 and its larger siblings. The horn is a three-trumpet cluster on a single solid bracket with a 12V solenoid already attached. We cover it in depth in our United Pacific 46129 review.
The bundle’s key difference from the horn-only 46129 is the air supply. Because it ships with its own compressor and tank, it works on vehicles without onboard air: pickups, vans, and older trucks with no air brakes. If your rig already has an air system, the bundle mostly duplicates what you have. For the rest of the lineup, see our United Pacific hub.
Specifications
| Spec | Value |
|---|---|
| Part number | United Pacific 46170 (bundle of 46129 horn + 46140 air kit) |
| Horn configuration | 3 chrome-plated trumpets on a single bracket |
| Advertised sound output | 145 dB ± 10 dB (test distance not disclosed) |
| Horn maximum pressure | 150 PSI |
| Valve | 12V heavy-duty electric solenoid, included |
| Horn material | Zinc alloy, chrome plated |
| Horn dimensions | 15-3/4” L × 12-1/2” W × 11-1/2” H (Big Rig Chrome Shop); 15-1/2” × 11-1/2” × 11-1/2” (Empire Chrome Shop) |
| Horn shipping weight | 12.1 lb (horn only) |
| Compressor | 12V, 12 A |
| Compressor auto-on / auto-off | 80 PSI / 110 PSI |
| Compressor size | 6” L × 3-1/2” W × 5” H (Big Rig); 6-1/2” × 3-1/2” × 5” (Empire) |
| Tank | 5.5 liters, 18” L × 5” W × 5-3/4” H |
| Tank fitting | 1/4” air hose |
| Compressor duty cycle / airflow | Not disclosed |
| Chord frequencies | Not disclosed |
| Kit weight | Not reliably disclosed (one dealer shows a “65.1” weight field with no unit) |
| Warranty | 6 months; no coverage for horns mounted upside down or under the truck |
| Street price | $499.00–$511.99 |
- Rated output
- 145 dB ±10 dB, distance not stated
- Working pressure
- 80–110 PSI (compressor cycle)
- Tank
- 5.5 L
- Electrical
- 12V, 12 A compressor
- Warranty
- 6 months
A note on the dB line: dealer copy gives the output as “145db (±10db),” so United Pacific’s own claim covers anything from 135 to 155 dB, and no listing says where the microphone was. Empire Chrome Shop softens it to “approximately 145 db.” Treat the number as a loudness class, not a measurement. Our advertised vs real-world decibels guide explains why the missing distance matters so much.
The pressure figures matter too. The horn is rated to 150 PSI, but the included compressor shuts off at 110 PSI, so as shipped the horn runs at 80–110 PSI. That is normal for a compact 12V kit, but it means the horn never sees its rated maximum. Our train horn PSI guide covers how pressure affects tone and volume.
What’s in the box
- 1 × United Pacific 46129 chrome 3-trumpet train horn on a single bracket
- 12V heavy-duty electric solenoid valve (comes fitted to the horn)
- Mounting pad and mounting bolts for the horn
- 1 × 46140 “turbo” 12V air compressor with auto on/off pressure switching
- 1 × 5.5-liter air tank with 1/4” air-hose fitting
What is not included matters just as much. Empire Chrome Shop’s listing says plainly that “all you need to supply is the air line and brass fittings (which are NOT included).” No relay, fuse, wiring harness, horn button, or pressure gauge is listed either. Budget for those and check our air line sizing guide and relay wiring guide before ordering.
Pros
- Complete 12V system under one part number. Horn, solenoid, compressor and tank come together, so a vehicle without onboard air can run it.
- Built-in pressure switching. The compressor turns on at 80 PSI and off at 110 PSI, so you don’t need to buy a separate pressure switch.
- Full-size three-trumpet horn. The 46129 is a larger horn than the mini cluster in the cheaper 46173 bundle. United Pacific gives it a higher 145 dB class rating, compared with 130 dB for the mini.
- Modest current draw. A 12 A compressor is easy to fuse and wire on a standard 12V system.
- Parts are sold separately. The 46129 horn, 46140 air kit and the 46127-5 replacement diaphragm all have their own part numbers, which makes repairs simpler.
Cons
- Loose loudness claim. “145 dB ±10 dB” with no test distance is a 20 dB window with no reference point.
- High price for what’s inside. At $499–$512, the bundle costs more than three times the 46129 horn alone, which sells for about $147–$152.
- Short, restrictive warranty. Coverage lasts only 6 months and is void if the horn is mounted upside down or under the truck. On many pickups, under the truck is the easiest place to mount it.
- Thin air-system specs. No compressor duty cycle, airflow (CFM), fill time or chord frequencies are published.
- Inconsistent listings. Dealers disagree on horn and compressor dimensions, and one shows a kit weight with no unit.
- Not a true plug-and-play kit. You still have to buy the air line, brass fittings and wiring parts.
Alternatives
- United Pacific 46173 Mini Train Horn Bundle: the same 46140 compressor and 5.5 L tank paired with a compact 4-trumpet mini horn. It is cheaper but carries a lower 130 dB class rating. Pick it if mounting space is tight.
- United Pacific 46129 horn only: the exact horn from this bundle, without the air kit. It is the logical choice for semi trucks and other vehicles that already have onboard air.
- Kleinn HK1 ProBlaster: a pickup-oriented complete kit that costs roughly $200 less, from a brand with deeper install documentation. It uses a dual-trumpet mini horn rather than three trumpets.
- Vevor 4-Trumpet 6L kit: a budget complete kit with a slightly larger tank at a fraction of the price. Its specs and build quality are the trade-off.
Install / compatibility notes
The 46170 is a 12V system. Both the compressor and the horn’s solenoid are 12V parts, so a 24V truck needs a step-down converter or 24V replacements. Our 12V vs 24V guide covers the options. The 12 A compressor draw is moderate, but it should still run through a relay and an inline fuse rather than a dash switch. See our amp draw and fuse sizing guide.
Mounting is where the warranty fine print bites. Big Rig Chrome Shop quotes United Pacific’s terms: there is no warranty on horns “mounted upside down or underneath the truck,” because that exposes them to road hazards and debris. On a semi there is usually room on the cab or frame rails. On a pickup, many buyers end up under the bed, which voids coverage. Plan a protected, upright location before ordering, and use our installation guide for the general sequence.
The 5.5 L tank measures 18” × 5” × 5-3/4” and uses a 1/4” air-hose fitting. That is small enough for a frame rail or bed corner, but it gives limited reserve for long blasts. See train horn air tank size. United Pacific doesn’t publish a duty cycle for the compressor, so avoid holding the horn down for long, repeated stretches. Our compressor duty cycle explainer explains why.
Finally, check your local rules before wiring a train horn into a road vehicle. Our train horn legality overview covers the state-by-state picture.
On real-world tone, owner impressions of United Pacific’s triple horns on Train Horn Forums are generally positive about sound for the price. A YouTube demo of the 46129, the horn in this bundle, gives a sense of its chord. Both are user reports, not measurements.
Sources
- United Pacific (UPtruckparts) — Standard Duty Train Horn Bundle 46170 product page, saved as PDF (via Vehicle Safety Supply) — official kit composition (46129 horn + 46140 compressor/5.5 L tank), “1 Train Horn / 1 Turbo Air Compressor and 5.5 Liter Tank System,” 6-month warranty, universal fitment, related SKUs 46140/46172/46175
- Big Rig Chrome Shop — Standard Duty Train Horn Bundle (UP46170) — $511.99 price; 145 dB (±10 dB); 150 PSI max; 12V solenoid; horn 15-3/4 × 12-1/2 × 11-1/2 in; compressor 12V / 12 A / 80 PSI on / 110 PSI off / 6 × 3-1/2 × 5 in; tank 5.5 L, 18 × 5 × 5-3/4 in, 1/4” fitting; 6-month warranty and mounting exclusion; “65.1” weight field with no unit
- Empire Chrome Shop — Chrome 3-bell train horn kit w/ compressor and air tank (UP 46170) — $499.00 price (out of stock at review time), “approximately 145 db,” air line and brass fittings not included, alternate horn and compressor dimensions
- Amazon — United Pacific 46129 listing — horn component: 3 trumpets on single bracket, 12V heavy-duty solenoid, 150 PSI max, mounting pad and bolts
- Vehicle Safety Supply — United Pacific 46129 — horn-only price ($146.84), 12.1 lb shipping weight
- FinditParts — United Pacific 46129 — “standard-duty” designation for the 46129 horn
- Milian Truck Center — 46129-UP Chrome 3 Trumpets Train Horn — horn-only price ($152.24), zinc alloy with chrome plating
- Premium Truck Parts USA — Chrome Economy 3 Trumpet Train Horn 46129 — economy/standard-tier positioning of the horn
- FinditParts — United Pacific 46127-5 diaphragm — replacement diaphragm cross-referenced to the 46129
- YouTube — “United Pacific 46129 Truck Horn” (sepa2401) — audio demo of the horn included in this bundle
- Train Horn Forums — “I still can’t get over how good United Pacific horns sound” — owner impressions of United Pacific triple-horn tone (user reports)
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
A one-SKU 12V train horn system for truck owners without onboard air who already buy from United Pacific dealers. The ±10 dB rating, 6-month warranty and roughly $500 price make better-documented kits the smarter pick for most buyers.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the United Pacific 46170 train horn bundle?
- Dealer listings give the included 46129 horn a rating of 145 dB with a ±10 dB tolerance and no stated test distance. That puts the manufacturer claim anywhere from 135 to 155 dB under unknown conditions. No independent measurement of this kit has been published.
- What comes in the 46170 bundle?
- According to United Pacific's product page, the bundle pairs the 46129 chrome 3-trumpet horn (with a 12V solenoid and mounting hardware) with the 46140 compressor and 5.5-liter tank kit. Air line and brass fittings are not included, and no relay, fuse or horn button is listed.
- What PSI does the 46170 run at?
- The included compressor switches on at 80 PSI and off at 110 PSI, so the horn runs between those pressures. The horn itself is rated for a 150 PSI maximum.
- Will the 46170 work on a 24V truck?
- Not directly. The compressor (12V, 12 A) and the horn solenoid are 12V parts, so a 24V vehicle needs a step-down converter or 24V-rated replacements. Trucks with onboard air may be better served by the horn-only 46129.
- What does the warranty cover?
- United Pacific gives the bundle a 6-month warranty. Dealer copy states there is no warranty on horns mounted upside down or underneath the truck.
