The Retainer,regulator, cataloged under National Stock Number 4220-01-256-3454, is classified within Federal Supply Class 4220 (Marine Lifesaving and Diving Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Retainer,regulator |
| FSC / FSG | 4220 — Marine Lifesaving and Diving Equipment (FSG 42) |
| Parameter | Value |
|---|---|
| NSN | 4220-01-256-3454 |
| Item Name | Retainer,regulator |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Reference | Meaning |
|---|---|
| 1049-03 | 5/9 Secondary reference Mar-Vel International, Inc. Dba Mar-Vel Underwater Equip |
| 1049-03 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4220-01-256-3454 is a Retainer,regulator, classified under FSC 4220, Marine Lifesaving and Diving Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 6130-01-376-9850, 6930-01-531-7180. Verify interchangeability with system specifications before substitution.
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.