The Valve Assembly,over, cataloged under National Stock Number 4820-01-665-4903, 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Supply Class 4820 (Valves, Nonpowered) of the Valves group. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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
Valve Assembly,over
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Technical Specifications
Parameter
Value
NSN
4820-01-665-4903
Item Name
Valve Assembly,over
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 Items8
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4710-01-665-4946V2C13818-2POSSIBLE MATCH
TUBE,METALLIC
Possible match (shared part number)Vacco Industries
4820-01-665-501412052507-01POSSIBLE MATCH
DIAPHRAGM,VALVE,FLAT
Possible match (shared part number)Vacco Industries
4330-01-665-507412052307-018POSSIBLE MATCH
FILTER ELEMENT,FLUID
Possible match (shared part number)Vacco Industries
5305-01-665-6289V2D11671-4CPOSSIBLE MATCH
SCREW,CAP,SOCKET HEAD
Possible match (shared part number)Vacco Industries
5305-01-665-6295V2D11680-10DPOSSIBLE MATCH
SCREW,CAP,SOCKET HEAD
Possible match (shared part number)Vacco Industries
5305-01-665-6297V2D11680-6DPOSSIBLE MATCH
SCREW,CAP,SOCKET HEAD
Possible match (shared part number)Vacco Industries
5305-01-665-6300V2D11670-5DPOSSIBLE MATCH
SCREW,CAP,SOCKET HEAD
Possible match (shared part number)Vacco Industries
5310-01-665-6376V2C13665-1POSSIBLE MATCH
PUSH ON NUT
Possible match (shared part number)Vacco Industries
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
12052302 ITEM 2
C/1Advisory reference — outside the item-of-supply concept
U.S. Government activity
12052302
D/9Drawing number reference only
U.S. Government activity
12052304-01
3/2Design control — primary reference
U.S. Government activity
Related Parts
4710-01-665-4946POSSIBLE MATCH
TUBE,METALLIC
V2C13818-2
4820-01-665-5014POSSIBLE MATCH
DIAPHRAGM,VALVE,FLAT
12052507-01
4330-01-665-5074POSSIBLE MATCH
FILTER ELEMENT,FLUID
12052307-018
5305-01-665-6289POSSIBLE MATCH
SCREW,CAP,SOCKET HEAD
V2D11671-4C
5305-01-665-6295POSSIBLE MATCH
SCREW,CAP,SOCKET HEAD
V2D11680-10D
5305-01-665-6297POSSIBLE MATCH
SCREW,CAP,SOCKET HEAD
V2D11680-6D
5305-01-665-6300POSSIBLE MATCH
SCREW,CAP,SOCKET HEAD
V2D11670-5D
5310-01-665-6376POSSIBLE MATCH
PUSH ON NUT
V2C13665-1
Frequently Asked Questions
What is NSN 4820-01-665-4903?
NSN 4820-01-665-4903 is a Valve Assembly,over, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-665-4903?
8 possible matches (shared part number, not a government interchangeability claim): 4710-01-665-4946, 4820-01-665-5014, 4330-01-665-5074. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-665-4903 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.