The Cylinder,air,diving Equipment, cataloged under National Stock Number 4220-01-656-6364, is classified within Federal Supply Class 4220 (Marine Lifesaving and Diving Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Naval Sea Systems Command. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Cylinder,air,diving Equipment |
| FSC / FSG | 4220 — Marine Lifesaving and Diving Equipment (FSG 42) |
| Manufacturers | Mesa International Technologies Inc Div Mesa Specialty Gases (CAGE 3SCZ5); Naval Sea Systems Command (CAGE 53711) |
| Parameter | Value |
|---|---|
| NSN | 4220-01-656-6364 |
| Primary Part Number | 7550077-F123 |
| Item Name | Cylinder,air,diving Equipment |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 7550077-F123 | Mesa International Technologies Inc Div Mesa Specialty Gases (USA) |
| 7550077-F123 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 11-GN-1101 | 5/2 Secondary reference U.S. Government activity |
| G649-4291-F123 | 5/1 Secondary reference U.S. Government activity |
NSN 4220-01-656-6364 is a Cylinder,air,diving Equipment, manufactured by Naval Sea Systems Command, classified under FSC 4220, Marine Lifesaving and Diving Equipment. Status: active.
NSN 4220-01-656-6364 has 2 manufacturer part numbers on file: 7550077-F123 (Mesa International Technologies Inc Div Mesa Specialty Gases), 7550077-F123 (Naval Sea Systems Command).
Hazardous per DLA record (HMIC Y). 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.