The Regulator,breathing Gas Pressure, cataloged under National Stock Number 4240-01-644-5790, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Veriflo Division. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-644-5790 |
| Primary Part Number | APR66S2P4XX4MSR580 |
| Item Name | Regulator,breathing Gas Pressure |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Veriflo Division |
| Status | ACTIVE |
| Flow Indicator | NOT INCLUDED |
| Overall Diameter | 2.250 INCHES NOMINAL IN |
| Mounting Method | PANEL |
| Pressure Gage | NOT INCLUDED |
| Installation Design | NONPORTABLE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| APR66S2P4XX4MSR580 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Veriflo Division (USA) |
| Reference | Meaning |
|---|---|
| APR66S2PXX4MSR580 | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Veriflo Division |
NSN 4240-01-644-5790 is a Regulator,breathing Gas Pressure, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Veriflo Division, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-644-5790 has 1 manufacturer part number on file: APR66S2P4XX4MSR580 (Parker-Hannifin Corporation Dba Pneutronics Div Veriflo Division).
Key specifications for APR66S2P4XX4MSR580: Overall Height: 6.11 INCHES NOMINAL IN; Flow Indicator: NOT INCLUDED; Overall Diameter: 2.250 INCHES NOMINAL IN; Mounting Method: PANEL. 5 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.