The Valve,compression Release, cataloged under National Stock Number 4820-01-121-8839, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Copeland Lp Dba Copeland Co. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Valve,compression Release |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Copeland Lp Dba Copeland Co (CAGE 5M9B9) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-121-8839 |
| Primary Part Number | 998-0510-26 |
| Item Name | Valve,compression Release |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Copeland Lp Dba Copeland Co |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 998-0510-26 PRIMARY | Copeland Lp Dba Copeland Co (USA) |
| Reference | Meaning |
|---|---|
| 510-0220-00 | 3/9 Design control — primary reference Copeland Corp |
| 510-0220-00 | 5/9 Secondary reference Copeland Lp Dba Copeland Co |
NSN 4820-01-121-8839 is a Valve,compression Release, manufactured by Copeland Lp Dba Copeland Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-121-8839 has 1 manufacturer part number on file: 998-0510-26 (Copeland Lp Dba Copeland Co).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-371-1287. 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.