OR37 O-Ring for Buckeye (Pack of 100)

The OR37 Valve Body O-Ring (Pack of 100) is a high-precision elastomeric seal engineered specifically for the primary pressure boundary of Buckeye fire extinguishers. Serving as the collar seal between the valve assembly and the cylinder neck, the OR37 is responsible for containing up to 195 PSI of nitrogen propellant. In the stored-pressure environment of a Buckeye ABC or Purple-K unit, this O-ring is the only barrier preventing the slow migration of expellant gas. A compromised OR37 results in a leaker, a unit that becomes a non-functional liability during a fire emergency.

Manufactured from high-grade Buna-N (Nitrile) rubber, the OR37 features a 70-durometer hardness, providing the essential resilience required for the high-torque threading of Buckeye valve bodies. This 100-pack bulk set is the logistical standard for fire protection service companies and industrial safety departments. By standardizing with the OR37 (comparable to Buckeye P/N 900001), technicians ensure that every serviced unit meets the rigorous leak-testing requirements of UL 299 and NFPA 10.

The OR37 must be replaced during every internal service in accordance with NFPA 10 requirements. Once the valve is unscrewed, the existing O-ring loses its elastomeric memory and will not reseal perfectly. Installing a fresh OR37 from this bulk pack is the only way to ensure the unit holds pressure for the next service cycle.

Before installation, apply a light coating of silicone-based lubricant to the OR37 to prevent pinching or rolling during valve reinstallation. Petroleum-based lubricants must be avoided, as they cause the Nitrile material to swell and fail, leading to an irreparable leak. Following installation, a calibrated leak test must be performed to verify zero pressure loss before the unit is returned to service. The OR37's compatibility with both metal and plastic Buckeye valve heads makes it a highly versatile truck-stock item for technicians managing mixed fleets.

Why can't I reuse the existing OR37 during a recharge?

Over its service life, Nitrile rubber undergoes compression set, where it permanently deforms to the shape of the valve seat. Once the valve is unscrewed, the O-ring loses its elastomeric memory and will not reseal perfectly. NFPA 10 mandates the installation of a new O-ring during every internal service to ensure the unit holds pressure for the next cycle.

Is the OR37 compatible with Buckeye's plastic and metal valve heads?

Yes. The OR37 is designed to fit the standard neck diameter used across the Buckeye portable line. This makes it a highly versatile truck-stock item for technicians managing mixed fleets of commercial-grade metal and consumer-grade plastic valve assemblies.

Does this O-ring require a specific lubricant?

To prevent pinching or rolling during the re-installation of the valve, a light coating of silicone-based lubricant is required. Petroleum-based lubricants must be avoided, as they cause the Nitrile material to swell and eventually fail, leading to an irreparable leak.