OR39 O-Ring for Amerex and Badger (Pack of 50)
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Wholesale PricingThe OR39 is a standard O-ring used in Amerex and Badger fire extinguisher valve assemblies — sold in a convenient 50-pack for high-volume fire extinguisher service shops. The OR39 size fits specific valve positions in Amerex and Badger portable fire extinguishers, serving as a pressure sealing element that maintains gas-tight integrity between valve body components. At $0.25 each in this 50-pack format, the OR39 is one of the most cost-effective fire extinguisher replacement parts available for shops performing high-volume Amerex and Badger extinguisher service.
O-rings are mandatory replacement items during every fire extinguisher internal examination and recharge — NFPA 10 prohibits reusing compressed or aged elastomer seals in the pressure path of a fire extinguisher valve assembly. The OR39 50-pack ensures a service shop can overhaul multiple Amerex and Badger units during a single service visit without running low on this critical consumable. The hose nozzle o ring, collar o-ring, and various valve body seals all share the same mandatory replacement requirement under NFPA 10, and keeping the correct o ring supply in stock eliminates service delays.
For fire equipment maintenance services contractors managing Amerex and Badger portable extinguisher fleets, the OR39 belongs on the standard service vehicle alongside the OR27 (100-pack for a different O-ring position), fill cap gaskets, and valve springs. Verify the OR39 is the correct size for the specific valve position being serviced using the Amerex fire extinguisher parts list or Badger fire extinguisher service manual before installation. These o rings small enough to be easy to misplace should be stored in labeled parts bins on your service vehicle.
| Feature | Details |
|---|---|
| Part Number | OR39 |
| Quantity | 50 per pack |
| Compatible Equipment | Amerex and Badger fire extinguisher valve assemblies |
| Unit Price | $0.25 each |
| Application | Valve body sealing — specific position per service manual |
| Service Requirement | Replace at every internal examination per NFPA 10 |
Mandatory Replacement
Under NFPA 10, all O-rings and seals in the pressure path of a fire extinguisher valve must be replaced during every internal examination — including 6-year and 12-year service intervals and any post-discharge service. The OR39 must never be reused after it has been removed from its seat. A previously compressed O-ring cannot be guaranteed to reseal reliably, and a slow valve leak resulting from a reused O-ring can deplete the extinguisher's pressure charge between inspections without triggering the pressure gauge alarm zone.
Lubrication
Before installing the OR39, apply a light coat of o ring grease or silicone-based lubricant compatible with the extinguisher's propellant and agent. Proper lubrication prevents the O-ring from tearing during installation and ensures complete seating in the valve groove. Do not use petroleum-based lubricants — they can degrade EPDM and nitrile elastomers used in fire extinguisher O-rings.
What is the difference between OR39 and OR27?
The OR39 and OR27 are different standard O-ring sizes used at different positions in Amerex and Badger valve assemblies. The OR27 is available in a 100-pack for a different valve sealing position. Always verify which O-ring size is required for the specific valve position being serviced using the Amerex fire extinguisher parts list or Badger fire extinguisher service manual — never substitute one size for another even if they appear similar.
Are these compatible with other brands besides Amerex and Badger?
The OR39 is sized for Amerex and Badger valve assemblies. While standard O-ring sizes (AS568 standard) are used across many fire extinguisher manufacturers, always verify the correct O-ring specification for your specific extinguisher model. Using an incorrectly sized O-ring voids the UL listing and creates a leak risk in the valve assembly.
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