ShopAmerex.com · Amerex 05239-P012 datasheet · https://shopamerex.com/products/amerex-05239-p012-quad-collar-o-ring-150-pack-of-12 · Figures as published by Amerex · Verified Sep 2, 2026
Genuine Amerex service part·Part no. 05239-P012
Amerex 05239-P012 Quad Collar O-Ring 150, Pack of 12
Amerex 05239-P012 is the Collar O-Ring (Parts Book item 19) that seals the cylinder collar where the valve assembly threads onto the agent cylinder of the 488 and 490 125 lb wheeled extinguishers (p.16), also listed for the Z-Series 756/758/759 (p.20) and the SF 1230 model 775 (p.26). Full overview ↓
- Part no.
- 05239-P012
- Pack
- 12 per pack
- Fits
- 488, 490, 756 +3 more
- Parts Book
- Page 18
- UPS-calculated at checkout. Free shipping on orders over $100.
- Returns per our refund policy.
Genuine Amerex part from an authorized Amerex distributor. Not a generic substitute.
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Which models does the Amerex 05239-P012 fit?
Per the Amerex Parts Book · page 18| Fits | Extinguisher | UL rating | Capacity | Price | Link |
|---|---|---|---|---|---|
| Model 488 |  10488 Amerex 488 125 lb Wheeled ABC Fire Extinguisher (CG)Parts Book p.16 |
30A:240B:C | 125 lb (56.7 kg) | $5,737.00 | View |
| Model 490 |  10490 Amerex 490 125 lb Wheeled Purple K Fire ExtinguisherParts Book p.16 |
320B:C | 125 lb (56.7 kg) | $6,549.00 | View |
| Model 756 |  27061 Amerex 756 250 lb Wheeled ABC Fire ExtinguisherParts Book p.20 |
40A:160B:C | 250 lb (113.4 kg) | $11,888.00 | View |
| Model 758 |  27063 Amerex 758 250 lb Wheeled Purple K Fire ExtinguisherParts Book p.20 |
160B:C | 250 lb (113.4 kg) | $13,364.00 | View |
| Model 759 |  27065 Amerex 759 125 lb Wheeled Purple K Fire ExtinguisherParts Book p.20 |
120B:C | 125 lb (56.7 kg) | $12,112.00 | View |
| Model 775 |  28325 Amerex 775 150 lb Wheeled SF 1230 Clean Agent Fire ExtinguisherParts Book p.26 |
3A:80B:C | 150 lb | $16,965.00 | View |
Parts list for 125/150 lb. dry chemical stored pressure wheeled models
Fitment per the Amerex Parts Book. Check the part number against your unit’s nameplate before ordering.
What is the Amerex 05239-P012?
Amerex 05239-P012 is the Collar O-Ring (Parts Book item 19) that seals the cylinder collar where the valve assembly threads onto the agent cylinder of the 488 and 490 125 lb wheeled extinguishers (p.16), also listed for the Z-Series 756/758/759 (p.20) and the SF 1230 model 775 (p.26). Amerex's manual directs cleaning the collar seat and threads and lightly brushing the o-ring seat with V-711 during recharge, and lists a leaking collar o-ring as a troubleshooting item fixed with a new o-ring. Sold in a pack of 12. Genuine Amerex parts protect the UL listing and warranty.
Amerex 05239-P012 specifications
| Part number | 05239-P |
|---|---|
| Description | Collar O-Ring |
| Parts Book page | 16 (PDF p. 18) |
| Diagram item | 19 |
| Pack quantity | 12 per pack |
| Models | 488, 490, 573, 575, 690, 756, 758, 759, 600, 775 |
|---|
| Amerex item number | 05239-P012 |
|---|
Part data as published by Amerex. Confirm against the current Parts Book revision before ordering for a unit in service.
Amerex 05239-P012 documents
Official Amerex publications · PDF- Parts Book p. 18 Collar O-Ring — parts list for 125/150 lb stored-pressure wheeled models 488, 490 (printed p.16)
- Parts Book p. 22 Collar O-Ring (item 20) on the Z-Series parts list (printed p.20)
- Parts Book p. 28 Collar O-Ring (item 23) on the 775 SF 1230 parts list (printed p.26)
- Owner's Manual (488/490)
- Owner's Manual (Z-Series 756/758/759)
- Owner's Manual (775)
- 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 18
Parts list for 125/150 lb. dry chemical stored pressure wheeled models · All 22 parts| Part no. | Part | Pack | Price | Quantity and add to cart |
|---|---|---|---|---|
| 03501 | 1 (sold individually) | $600.00 | ||
| 03556-P006 | 6 per pack | $14.99 | ||
| 03562-P001 | 1 (sold individually) | $11.99 | ||
| 03678-P001 | 1 (sold individually) | $505.00 | ||
| 04938 | 1 (sold individually) | $110.00 | ||
| 05067-P001 | 1 (sold individually) | $17.99 | ||
| 05197 | 1 (sold individually) | $671.00 | ||
| 06059 | 1 (sold individually) | $132.00 |
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 05239-P012 questions
What does the Amerex 05239-P012 collar o-ring fit?
The 488 and 490 125 lb wheeled dry chemical extinguishers (Parts Book p.16), the Z-Series 756, 758 and 759 (p.20), and the 775 SF 1230 wheeled unit (p.26).
How many come in a pack?
12, per the store SKU's -P012 suffix.
What does the collar o-ring seal?
It seals the collar joint where the operating valve assembly threads onto the top of the agent cylinder.
What is the fix for a leak at the collar o-ring?
Amerex's troubleshooting guide says to remove the valve assembly, discard the old o-ring, clean the collar and groove, and install a new o-ring lubricated with V-711.
Is the Amerex 05239-P012 a genuine Amerex part?
Yes. Amerex's Parts Book notice states genuine parts are required to protect the UL listing and keep the warranty in effect.
Where is the 05239-P listed in the Amerex Parts Book?
Printed page 16, item 19 (PDF page 18); it recurs on pages 20, 22 and 26 for other wheeled families, and the same o-ring also seals the 05152 hydro-test cylinder adapter (p.29).