The Cap,valve, cataloged under National Stock Number 4820-01-121-1899, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
Cap,valve
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Technical Specifications
Parameter
Value
NSN
4820-01-121-1899
Item Name
Cap,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-121-2036592-5-3POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Flowserve Corporation Div Flowserve Us Inc
5340-01-328-8500POSSIBLE MATCH
SHIELD,EXPANSION
Possible match (shared part number)
7530-01-419-3284ESS59252POSSIBLE MATCH
FOLDER,FILE,HANGING
Possible match (shared part number)Mba Office Supply, Inc.
6750-01-427-2441POSSIBLE MATCH
FILM,PHOTOGRAPHIC
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
2213-5A PIECE 2
5/2Secondary reference
U.S. Government activity
2213-5A
D/9Drawing number reference only
U.S. Government activity
592-5-2
3/2Design control — primary reference
U.S. Government activity
Related Parts
4820-01-121-2036POSSIBLE MATCH
DISK,VALVE
592-5-3
5340-01-328-8500POSSIBLE MATCH
SHIELD,EXPANSION
7530-01-419-3284POSSIBLE MATCH
FOLDER,FILE,HANGING
ESS59252
6750-01-427-2441POSSIBLE MATCH
FILM,PHOTOGRAPHIC
Frequently Asked Questions
What is NSN 4820-01-121-1899?
NSN 4820-01-121-1899 is a Cap,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-121-1899?
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-121-2036, 5340-01-328-8500, 7530-01-419-3284. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-121-1899 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.