The Regulator,breathing Gas Pressure, cataloged under National Stock Number 4220-01-256-8725, 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 4 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4220-01-256-8725 |
| Item Name | Regulator,breathing Gas Pressure |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Status | ACTIVE |
| Flow Indicator | NOT INCLUDED |
| Pressure Gage | NOT INCLUDED |
| 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 |
|---|---|
| 1088-10 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| 1088-10 | 5/9 Secondary reference Mar-Vel International, Inc. Dba Mar-Vel Underwater Equip |
| 1088-10 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4220-01-256-8725 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): 6105-01-327-5144. Verify interchangeability with system specifications before substitution.
Key specifications for 4220-01-256-8725: Flow Indicator: NOT INCLUDED; Pressure Gage: NOT INCLUDED; On-Off Switch: NOT INCLUDED; Installation Design: PORTABLE. 4 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.