ShopAmerex.com · Amerex 09899 datasheet · https://shopamerex.com/products/amerex-09899-co2-wheeled-unit-shut-off-valve-stem-assembly · Figures as published by Amerex · Verified Sep 2, 2026
Genuine Amerex service part·Part no. 09899
Amerex 09899 CO2 Wheeled Unit Shut-Off Valve Stem Assembly
Amerex 09899 is the valve stem assembly for the horn squeeze-grip shut-off valve on the Amerex 333 (50 lb) and 334 (100 lb) carbon dioxide wheeled extinguishers, listed as item 22 on Parts Book printed page 21 (PDF page 23). Full overview ↓
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Which models does the Amerex 09899 fit?
Per the Amerex Parts Book · page 23| Fits | Extinguisher | UL rating | Capacity | Price | Link |
|---|---|---|---|---|---|
| Model 333 |  09330 Amerex 333 50 lb Wheeled CO2 Fire ExtinguisherParts Book printed p.21, item 22 |
20B:C | 50 lb (22.7 kg) | $3,862.00 | View |
| Model 334 |  09331 Amerex 334 100 lb Wheeled CO2 Fire ExtinguisherParts Book printed p.21, item 22 |
20B:C | 100 lb (45.4 kg) | $5,708.00 | View |
Parts list for 50/100 lb. carbon dioxide wheeled models
Fitment per the Amerex Parts Book. Check the part number against your unit’s nameplate before ordering.
What is the Amerex 09899?
Amerex 09899 is the valve stem assembly for the horn squeeze-grip shut-off valve on the Amerex 333 (50 lb) and 334 (100 lb) carbon dioxide wheeled extinguishers, listed as item 22 on Parts Book printed page 21 (PDF page 23). It is the stem inside the shut-off valve assembly, Amerex 09366, that seats to start and stop CO2 flow through the horn as the discharge lever is squeezed and released. The owner's service manual calls for checking the horn shutoff lever for freedom of movement during annual maintenance and disassembling the nozzle to replace or lubricate parts if the operation is impeded. Amerex requires genuine factory parts to protect the UL listing and keep the warranty in effect.
Amerex 09899 specifications
| Part number | 09899 |
|---|---|
| Description | Valve Stem Assembly for Shut-off Valve |
| Parts Book page | Printed page 21 (PDF page 23) |
| Diagram item | 22 |
| Models | 333, 334 |
|---|
| Amerex item number | 09899 |
|---|
Part data as published by Amerex. Confirm against the current Parts Book revision before ordering for a unit in service.
Amerex 09899 documents
Official Amerex publications · PDF- Parts Book p. 23 Parts list for 50/100 lb carbon dioxide wheeled models 333, 334 (printed p.21)
- Owner's Service Manual — Models 333/334 Installation, operation, inspection, maintenance and recharge
- Wheeled Fire Extinguisher Catalog 333/334 specification table (printed p.10)
- Tech Tip Why genuine Amerex parts
- Warranty
Current Amerex publications, hosted on ShopAmerex so links do not break when Amerex reorganizes its site.
Other parts on Parts Book page 23
Parts list for 50/100 lb. carbon dioxide wheeled models · All 19 parts| Part no. | Part | Pack | Price | Quantity and add to cart |
|---|---|---|---|---|
| 08169 | Each | $32.99 | ||
| 09364 | Each | $395.00 | ||
| 09366 | Each | $108.00 | ||
| 09369 | Each | $39.99 | ||
| 09545 | Each | $323.00 | ||
| 09618 | Each | $13.99 | ||
| 09623-P001 | Pack of 1 | $193.00 | ||
| 09787 | Each | $21.99 |
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 09899 questions
What does the Amerex 09899 valve stem assembly fit?
The shut-off (horn squeeze-grip) valve on the Amerex 333 (50 lb) and 334 (100 lb) carbon dioxide wheeled fire extinguishers.
What does this valve stem do?
It seats inside the shut-off valve to start and stop CO2 flow through the horn when the discharge lever is squeezed and released.
Where is part 09899 listed in the Amerex Parts Book?
Item 22 on printed page 21 (PDF page 23) of Parts Book 27277 Rev D.
When should the shut-off valve stem be inspected?
During annual maintenance, when the horn shutoff lever is squeezed and released several times to check freedom of movement; if the operation is impeded the manual has the technician disassemble the nozzle and replace or lubricate parts.
How does the Amerex 09899 differ from the valve stem in the cylinder valve?
The 09899 is the stem for the shut-off valve at the horn (item 22); the cylinder valve uses a separate valve stem assembly, part 09897-P (item 11).
Does the Amerex 09899 carry its own UL rating?
No — it is a service part. The assembled Amerex 333 and 334 carry a 20B:C UL and ULC rating.
Which extinguishers does Parts Book printed page 21 cover?
The 50/100 lb carbon dioxide wheeled models — the Amerex 333 (50 lb) and the Amerex 334 (100 lb).
Is the Amerex 09899 a genuine Amerex part?
Yes — it is the factory shut-off valve stem assembly listed in the Amerex Parts Book; Amerex states that substitute parts void the UL listing and the warranty.