ShopAmerex.com · Amerex 09901 datasheet · https://shopamerex.com/products/amerex-09901-co2-valve-spring · Figures as published by Amerex · Verified Sep 2, 2026
Genuine Amerex service part·Part no. 09901
Amerex 09901 CO2 Valve Spring
Amerex 09901 is the spring for the shut-off valve on the Amerex 333 (50 lb) and 334 (100 lb) carbon dioxide wheeled fire extinguishers, listed as item 23 on Parts Book printed page 21 (PDF page 23). Full overview ↓
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Which models does the Amerex 09901 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 23 |
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 23 |
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 09901?
Amerex 09901 is the spring for the shut-off valve on the Amerex 333 (50 lb) and 334 (100 lb) carbon dioxide wheeled fire extinguishers, listed as item 23 on Parts Book printed page 21 (PDF page 23). The shut-off valve at the horn is a squeeze-grip design: the operator squeezes the lever to discharge and releases it to stop, and the spring returns the lever. The Parts Book lists it beside the shut-off valve assembly (Amerex 09366) and that valve's stem assembly (Amerex 09899). Amerex requires genuine factory parts to protect the UL listing and keep the warranty in effect.
Amerex 09901 specifications
| Part number | 09901 |
|---|---|
| Description | Spring for Shut-off Valve |
| Parts Book page | Printed page 21 (PDF page 23) |
| Diagram item | 23 |
| Models | 333, 334 |
|---|
| Amerex item number | 09901 |
|---|
Part data as published by Amerex. Confirm against the current Parts Book revision before ordering for a unit in service.
Amerex 09901 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 09901 questions
What does the Amerex 09901 spring fit?
The shut-off valve on the Amerex 333 (50 lb) and 334 (100 lb) carbon dioxide wheeled fire extinguishers.
What does this spring do?
It is the spring in the squeeze-grip shut-off valve, which the operator squeezes to discharge and releases to stop the flow of carbon dioxide through the horn.
Where is part 09901 listed in the Amerex Parts Book?
Item 23 on printed page 21 (PDF page 23) of Parts Book 27277 Rev D.
Which related parts are listed next to it?
The shut-off valve assembly (Amerex 09366, item 21), its valve stem assembly (Amerex 09899, item 22) and the handle with rubber cover (Amerex 09896, item 24).
When is the shut-off valve spring replaced?
At annual maintenance, if squeezing and releasing the horn shutoff lever shows the operation is impeded, the manual has the nozzle disassembled and parts replaced or properly lubricated.
Is this the same as the spring inside the cylinder valve?
No — the cylinder valve uses a separate spring, part 00501-P (item 12).
Does the Amerex 09901 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.
Is the Amerex 09901 a genuine Amerex part?
Yes — it is the factory shut-off valve spring listed in the Amerex Parts Book; Amerex states that substitute parts void the UL listing and the warranty.