ShopAmerex.com · Amerex 03818 datasheet · https://shopamerex.com/products/amerex-03818-nitrogen-hose-assembly-1-4-x-16 · Figures as published by Amerex · Verified Sep 2, 2026
Genuine Amerex service part·Part no. 03818
Amerex 03818 Nitrogen Hose Assembly, 1/4 x 16
Amerex 03818 is the Nitrogen Hose Assembly listed as item 5 on printed page 18 (PDF page 20) of Amerex Parts Book 27277 Rev D, for 125/150 lb dry chemical wheeled models 450 (125 lb ABC) and 452 (125 lb Purple K). Full overview ↓
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Which models does the Amerex 03818 fit?
Per the Amerex Parts Book · page 20| Fits | Extinguisher | UL rating | Capacity | Price | Link |
|---|---|---|---|---|---|
| Model 450 |  11483 Amerex 450 125 lb Wheeled ABC Fire ExtinguisherParts Book p.18 |
30A:240B:C | 125 lb (57 kg) | $4,960.00 | View |
| Model 452 |  10643 Amerex 452 125 lb Wheeled Purple K Fire ExtinguisherParts Book p.18 |
320B:C | 125 lb (57 kg) | $6,671.00 | View |
Parts list for 125/150 lb. dry chemical wheeled models, 23 cu. ft. nitrogen cylinder
Fitment per the Amerex Parts Book. Check the part number against your unit’s nameplate before ordering.
What is the Amerex 03818?
Amerex 03818 is the Nitrogen Hose Assembly listed as item 5 on printed page 18 (PDF page 20) of Amerex Parts Book 27277 Rev D, for 125/150 lb dry chemical wheeled models 450 (125 lb ABC) and 452 (125 lb Purple K). It runs from the nitrogen cylinder's "T" handle valve to the gas tube inlet port on the agent cylinder; manual 05605 has the technician connect it firmly and kink free, and warns that a check valve keeps nitrogen from escaping the agent cylinder when this hose is disconnected, so the agent cylinder may still be pressurized. Amerex requires the nitrogen supply hose assembly to be hydrostatically tested every 12 years at 3000 psi.
Amerex 03818 specifications
| Part number | 03818 |
|---|---|
| Description | Nitrogen Hose Assembly |
| Hose size | 1/4 x 16 (Amerex webstore listing) |
| Parts Book page | Printed page 18 (PDF page 20) |
| Diagram item | 5 |
| Pack quantity | 1 (sold individually) |
| Hydrostatic test interval | 12 years at 3000 psi (nitrogen supply hose) |
| Models | 450, 452 |
|---|
| Amerex item number | 03818 |
|---|
Part data as published by Amerex. Confirm against the current Parts Book revision before ordering for a unit in service.
Amerex 03818 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 20
Parts list for 125/150 lb. dry chemical wheeled models, 23 cu. ft. nitrogen cylinder · All 11 parts| Part no. | Part | Pack | Price | Quantity and add to cart |
|---|---|---|---|---|
| 03784 | 1 (sold individually) | $126.00 | ||
| 03785 | 1 (sold individually) | $151.00 | ||
| 03787-P001 | Pack of 1 | $200.00 | ||
| 03817 | Each | $1,188.00 | ||
| 04072 | 1 (sold individually) | $30.99 | ||
| 06467 | 1 (sold individually) | $191.00 | ||
| 11970 | Each | $6.99 | ||
| 13956 | 1 (sold individually) | $4.99 |
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 03818 questions
What does the Amerex 03818 nitrogen hose assembly fit?
Amerex 125/150 lb nitrogen cylinder wheeled dry chemical models 450 (125 lb ABC) and 452 (125 lb Purple K).
What size is the Amerex 03818 hose?
Amerex's webstore lists it as 1/4 x 16. The Parts Book gives only the description "Nitrogen Hose Assembly" for item 5.
Where is part 03818 in the Amerex Parts Book?
Item 5 on printed page 18 (PDF page 20) of Parts Book 27277 Rev D.
Can pressure remain in the extinguisher after this hose is disconnected?
Yes. Manual 05605 states that a check valve in the system prevents nitrogen pressure from escaping the agent cylinder when the nitrogen hose is disconnected, so the agent cylinder may be pressurized even though no pressure escapes at the cylinder connection.
How often must the nitrogen supply hose be hydrostatically tested?
Every 12 years, at a test pressure of 3000 psi, per manual 05605.
Does the same hose fit the 300 lb wheeled models 491 and 493?
No. The Parts Book lists 07292 as the nitrogen hose assembly for those models on printed page 19.
Is the Amerex 03818 a genuine Amerex part?
Yes. Amerex's Parts Book notice states that Amerex replacement parts must be used to protect the UL listing and keep the warranty in effect.