ShopAmerex.com · Amerex 03787-P001 datasheet · https://shopamerex.com/products/amerex-03787-p001-safety-disc-assembly-v23-pack-of-1 · Figures as published by Amerex · Verified Sep 2, 2026
Genuine Amerex service part·Part no. 03787-P001
Amerex 03787-P001 Safety Disc Assembly, V23 (Pack of 1)
Amerex 03787-P001 is the Safety Disc Assembly, sold as a pack of one, listed in Amerex Parts Book 27277 Rev D as item 3 for the 125/150 lb nitrogen cylinder wheeled models 450 and 452 (printed page 18), item 3 for the 300/350 lb models 491 and 493 (printed page 19), and item 17 for the 150 lb Halon 1211 wheeled model 600 (printed page 22). Full overview ↓
- Part no.
- 03787-P001
- Pack
- Pack of 1
- Fits
- 450, 452, 491 +1 more
- Parts Book
- Page 20
- Free shipping (orders over $100)
- Returns per our refund policy.
Genuine Amerex part from an authorized Amerex distributor. Not a generic substitute.
Ordering parts for a service route?
Quotes for part lists, PO and tax-exempt orders, and parts not yet listed.
Which models does the Amerex 03787-P001 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 |
| Model 491 |  11677 Amerex 491 300 lb Wheeled ABC Fire ExtinguisherParts Book p.19 |
40A:320B:C | 300 lb (136.07 kg) | $9,515.00 | View |
| Model 493 |  15505 Amerex 493 300 lb Wheeled Purple K Fire ExtinguisherParts Book p.19 |
320B:C | 300 lb (136.07 kg) | $9,413.00 | 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 03787-P001?
Amerex 03787-P001 is the Safety Disc Assembly, sold as a pack of one, listed in Amerex Parts Book 27277 Rev D as item 3 for the 125/150 lb nitrogen cylinder wheeled models 450 and 452 (printed page 18), item 3 for the 300/350 lb models 491 and 493 (printed page 19), and item 17 for the 150 lb Halon 1211 wheeled model 600 (printed page 22). Manual 05605 requires a careful annual inspection of the safety relief on models 450, 451 and 452 to confirm it has not ruptured, corroded or been tampered with, and instructs technicians to tighten only the large hex nut, leaving the factory-torqued small round nut alone, and to replace the complete assembly if it is damaged or ruptured.
Amerex 03787-P001 specifications
| Part number | 03787-P001 |
|---|---|
| Parts Book part number | 03787-P |
| Description | Safety Disc Assembly |
| Parts Book page | Printed page 18 (PDF page 20); printed page 19 (PDF page 21); printed page 22 (PDF page 24) |
| Diagram item | 3 (printed pp.18-19); 17 (printed p.22) |
| Pack quantity | 1 |
| Models | 450, 452 (printed p.18); 491, 493 (printed p.19); 600 (printed p.22) |
|---|
| Amerex item number | 03787-P001 |
|---|
Part data as published by Amerex. Confirm against the current Parts Book revision before ordering for a unit in service.
Amerex 03787-P001 documents
Official Amerex publications · PDF- Parts Book p. 20 Item 3, 125/150 lb wheeled parts list (printed p.18)
- Parts Book p. 21 Item 3, 300/350 lb wheeled parts list (printed p.19)
- Parts Book p. 24 Item 17, 150 lb Halon 1211 model 600 parts list (printed p.22)
- Owner's Service Manual (450, 452) 125/150 lb nitrogen cylinder dry chemical wheeled extinguishers
- Owner's Service Manual (491, 493) 300/350 lb nitrogen cylinder dry chemical wheeled extinguishers
- 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 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 | ||
| 03817 | Each | $1,188.00 | ||
| 03818 | 1 (sold individually) | $156.00 | ||
| 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 03787-P001 questions
What does the Amerex 03787-P001 safety disc assembly fit?
Amerex wheeled models 450 and 452 (125 lb dry chemical), 491 and 493 (300 lb dry chemical), and the 150 lb Halon 1211 model 600.
How many safety disc assemblies come in the Amerex 03787-P001?
One. The -P001 suffix is the pack-of-1 listing of the part the Parts Book prints as 03787-P.
Where is part 03787-P in the Amerex Parts Book?
Item 3 on printed pages 18 and 19 (PDF pages 20 and 21) and item 17 on printed page 22 (PDF page 24) of Parts Book 27277 Rev D.
Can the safety disc assembly be adjusted if it leaks?
Only in part. Manuals 05605 and 05614 say to inspect the safety outlet for tightness or damage and tighten only the large hex nut; the small round nut containing the holes is factory set to a specific torque and must not be adjusted. If it is damaged or ruptured, replace the complete Amerex safety disc assembly.
How often should the safety disc be inspected?
Manual 05605 calls for a careful inspection at annual maintenance on models 450, 451 and 452 to confirm it has not ruptured, corroded or been tampered with.
Does the 03787-P fit the Z-Series wheeled models 756 and 758?
No. Parts Book printed page 20 specifies 08573-P Safety Disc Assembly for that family, except on 690 and 759, which take a 14218-P pipe plug.
Is the Amerex 03787-P001 a genuine Amerex part?
Yes. Manual 05605 states that only factory replacement parts are approved for use on Amerex fire extinguishers.