The Cap Assembly, cataloged under National Stock Number 4820-01-209-2954, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-209-2954 |
| Item Name | Cap Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 803-5001057-SX-XXX-13 | 5/1 Secondary reference Naval Sea Systems Command |
| 803-5001057-1/2-040 PCS.3,9,10 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 803-5001057-S1-040-3,9,10,11 | 5/1 Secondary reference Naval Sea Systems Command |
| 803-5001057-S1-040-3,9,10 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-01-209-2954 is a Cap Assembly, classified under FSC 4820, Valves, Nonpowered. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 4730-01-437-6225, 4330-01-439-3839, 4820-01-517-2831. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-209-2954: Criticality Code Justification: ZZZY; Special Features: CHANGE FSC; C.A.R.; JX9.; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS. 2 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.
NSN 4820-01-209-2954 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
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.