The Regulator,breathing Gas Pressure, cataloged under National Stock Number 4220-01-221-8953, is classified within Federal Supply Class 4220 (Marine Lifesaving and Diving Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4220-01-221-8953 |
| Item Name | Regulator,breathing Gas Pressure |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Status | ACTIVE |
| Overall Diameter | 1.890 INCHES NOMINAL IN |
| Lighted Panel | NOT INCLUDED |
| Pressure Gage | NOT INCLUDED |
| Inlet Connection Size | 1/4 IN. NPT IN |
| On-Off Switch | NOT INCLUDED |
| Installation Design | PORTABLE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 269-398 | 3/9 Design control — primary reference Tescom Corp Instrument Div |
| 249-378 | 5/9 Secondary reference Tescom Corp Instrument Div |
NSN 4220-01-221-8953 is a Regulator,breathing Gas Pressure, classified under FSC 4220, Marine Lifesaving and Diving Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5925-01-607-3296. Verify interchangeability with system specifications before substitution.
Key specifications for 4220-01-221-8953: Overall Height: 3.180 INCHES NOMINAL IN; Overall Diameter: 1.890 INCHES NOMINAL IN; Lighted Panel: NOT INCLUDED; Pressure Gage: NOT INCLUDED. 6 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.
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.