The Regulator,breathing Gas Pressure, cataloged under National Stock Number 4220-01-039-1963, 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 Morse Diving, Inc.. Government technical data includes 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4220-01-039-1963 |
| Primary Part Number | 8800-20 |
| Item Name | Regulator,breathing Gas Pressure |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Manufacturer | Morse Diving, Inc. |
| Status | ACTIVE |
| Flow Indicator | NOT INCLUDED |
| Lighted Panel | NOT INCLUDED |
| Pressure Gage | NOT INCLUDED |
| On-Off Switch | NOT INCLUDED |
| Filler Connection Size | 0.875-20 UNEF |
| Mask Connection Size | 0.750-16 UNF |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 8800-20 PRIMARY | Morse Diving, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 4666858 | 5/9 Secondary reference Naval Sea Systems Command |
| 4666858 | 1/2 Source control — Government-approved source U.S. Government activity |
| 3900-49 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4220-01-039-1963 is a Regulator,breathing Gas Pressure, manufactured by Morse Diving, Inc., classified under FSC 4220, Marine Lifesaving and Diving Equipment. Status: active.
NSN 4220-01-039-1963 has 1 manufacturer part number on file: 8800-20 (Morse Diving, Inc.).
3 possible matches (shared part number, not a government interchangeability claim): 6515-01-525-3705, 5985-01-552-0956, 1680-01-594-9845. Verify interchangeability with system specifications before substitution.
Key specifications for 8800-20: Flow Indicator: NOT INCLUDED; Lighted Panel: NOT INCLUDED; Pressure Gage: NOT INCLUDED; On-Off Switch: NOT INCLUDED. 7 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.