ShopAmerex.com · Amerex 19789 datasheet · https://shopamerex.com/products/amerex-19789-gauge-125-brass-novec · Figures as published by Amerex · Verified Sep 2, 2026
Genuine Amerex service part·Part no. 19789
Amerex 19789 Gauge 125 Brass Novec
Amerex 19789 is the pressure gauge for the Amerex Model 775 150 lb SF 1230 wheeled clean agent extinguisher, listed as item 21, part 19789, Gauge 125 SF 1230, on Parts Book PN 27277 REV D, page 26 (PDF page 28). Full overview ↓
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Which models does the Amerex 19789 fit?
Per the Amerex Parts Book · page 28| Fits | Extinguisher | UL rating | Capacity | Price | Link |
|---|---|---|---|---|---|
| Model 775 |  28325 Amerex 775 150 lb Wheeled SF 1230 Clean Agent Fire ExtinguisherItem 21 on the Model 775 parts page |
3A:80B:C | 150 lb | $16,965.00 | View |
Parts list for 150 lb. SF 1230 wheeled model
Fitment per the Amerex Parts Book. Check the part number against your unit’s nameplate before ordering.
What is the Amerex 19789?
Amerex 19789 is the pressure gauge for the Amerex Model 775 150 lb SF 1230 wheeled clean agent extinguisher, listed as item 21, part 19789, Gauge 125 SF 1230, on Parts Book PN 27277 REV D, page 26 (PDF page 28). Amerex protects the pressure gauge on this model with a stainless-steel gauge guard. The monthly inspection checks that the gauge reading is in the operable range, and a gauge that is bent, damaged, defective or leaking at the threads is replaced after the extinguisher is depressurized. Gauge threads are epoxy coated at the factory, so the new gauge is installed with a 24-hour two-part epoxy. Amerex replacement parts must be used to protect the UL listing and keep the warranty in effect.
Amerex 19789 specifications
| Part number | 19789 |
|---|---|
| Parts Book description | Gauge 125 SF 1230 |
| Parts Book item number | 21 |
| Parts Book page | 26 (PDF page 28) |
| Model | 775 |
|---|---|
| Extinguisher | Amerex 775 150 lb wheeled SF 1230 clean agent extinguisher |
| Amerex item number | 19789 |
|---|
Part data as published by Amerex. Confirm against the current Parts Book revision before ordering for a unit in service.
Amerex 19789 documents
Official Amerex publications · PDFCurrent Amerex publications, hosted on ShopAmerex so links do not break when Amerex reorganizes its site.
Other parts on Parts Book page 28
Parts list for 150 lb. SF 1230 wheeled model · All 10 parts| Part no. | Part | Pack | Price | Quantity and add to cart |
|---|---|---|---|---|
| 19787 | Each | $237.00 | ||
| 19793 | Each | $276.00 | ||
| 21920 | Each | $1,042.00 | ||
| 21941 | Each | $508.00 | ||
| 22978 | Each | $1,002.00 | ||
| 22984 | Each | $82.99 | ||
| 23544 | Each | $905.00 | ||
| 23634 | Each | $1,202.00 |
Item numbers refer to the exploded view on the Parts Book page. Model-specific items are marked in the Amerex parts list; confirm before ordering.
Amerex 19789 questions
What does the Amerex 19789 gauge fit?
The Amerex Model 775 150 lb SF 1230 wheeled clean agent extinguisher. It is item 21 on the Model 775 parts page of Parts Book PN 27277 REV D.
When does the Amerex 775 pressure gauge need to be replaced?
When it is bent, damaged or the wrong gauge, when it is defective, or when it leaks around the gauge threads; the extinguisher is depressurized first.
How is a replacement gauge installed?
The Owner's Manual directs installing the new gauge using a 24-hour two-part epoxy on the gauge threads.
How is the old gauge removed?
Factory gauge threads are coated with a special epoxy, so the manual directs soaking the valve assembly in 180 degrees F water for two to four minutes and removing the gauge with a 7/16 in. open end wrench.
Is the gauge protected on the Amerex 775?
Yes. Amerex lists a stainless-steel gauge guard protecting the pressure gauge as a published feature of the SF 1230 wheeled extinguisher; the guard is a separate part, item 19.
Does the Amerex 19789 fit any other model?
Parts Book PN 27277 REV D lists part 19789 on one parts page only, the Model 775 150 lb stored pressure wheeled SF 1230 extinguisher on page 26.