The Regulator,compressed Gas, cataloged under National Stock Number 4820-01-078-8174, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Messer Llc. Government technical data includes 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-078-8174 |
| Primary Part Number | 043-22101-590-1/4 NPT MALE OPT 4 |
| Item Name | Regulator,compressed Gas |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Messer Llc |
| Status | ACTIVE |
| Outlet Indicator Type | DIAL PRESSURE GAGE |
| Inlet Indicator Type | DIAL PRESSURE GAGE |
| Inlet Fitting Connection Type | COMPRESSED GAS ASSOCIATION |
| Outlet Fitting Thread Direction | RIGHT-HAND |
| Outlet Fitting Nominal Thread Size | 0.250 INCHES IN |
| Mounting Method | CYLINDER |
| Mounting Position | RIGHT SIDE |
| Inlet Fitting Connection Cga Number | 590 |
| Features Provided | RELIEF VALVE |
| Specification/standard Data | 12436-7010049 MANUFACTURERS SPECIFICATION CONTROL |
| Maximum Delivery Pressure | 400.0 POUNDS PER SQUARE INCH LBS |
| Delivery Pressure Type | ADJUSTABLE |
| Outlet Fitting Connection Type | THREADED EXTERNAL PIPE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 043-22101-590-1/4 NPT MALE OPT 4 PRIMARY | Messer Llc (USA) |
| Reference | Meaning |
|---|---|
| 043-22100(590)1-4INNPTMALEOPT4 | 5/9 Secondary reference Messer Llc |
| 7010049 | 7/2 Vendor item drawing reference Bae Systems Information and Electronic Systems Integration Inc. Div Bae Systems Information & Electronic Systems Integration Inc |
| 5417F4A-CGA590 | 5/9 Secondary reference Circor Instrumentation Technologies, Inc. Dba Hoke Gyrolok |
NSN 4820-01-078-8174 is a Regulator,compressed Gas, manufactured by Messer Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-078-8174 has 1 manufacturer part number on file: 043-22101-590-1/4 NPT MALE OPT 4 (Messer Llc).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-177-8508, 2350-01-458-7550. Verify interchangeability with system specifications before substitution.
Key specifications for 043-22101-590-1/4 NPT MALE OPT 4: Outlet Indicator Type: DIAL PRESSURE GAGE; Inlet Indicator Type: DIAL PRESSURE GAGE; Inlet Fitting Connection Type: COMPRESSED GAS ASSOCIATION; Outlet Fitting Thread Direction: RIGHT-HAND. 13 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4820-01-078-8174 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.