NSN 4820-01-149-4963 · NIIN 011494963 · Part number 3IN R1020-43AA-1FM
Dover Resources, Inc. Div Norriseal · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 1NB39
Government record, cited
NSN 4820-01-149-4963 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-149-4963. Manufacturer of record part number: 3IN R1020-43AA-1FM.
Manufacturer of record: Dover Resources, Inc. Div Norriseal
Identification
NSN: 4820-01-149-4963
NIIN: 011494963
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 3IN R1020-43AA-1FM
Manufacturer: Dover Resources, Inc. Div Norriseal
General Description
The Valve,butterfly, cataloged under National Stock Number 4820-01-149-4963, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Dover Resources, Inc. Div Norriseal. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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,butterfly
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Manufacturers
Dover Resources, Inc. Div Norriseal (CAGE 1NB39)
Technical Specifications
Parameter
Value
NSN
4820-01-149-4963
Primary Part Number
3IN R1020-43AA-1FM
Item Name
Valve,butterfly
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Dover Resources, Inc. Div Norriseal
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 Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-149-507051310B171POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Norriseal Norris Values Div Dba Dover Co
4820-01-155-77511061353POSSIBLE MATCH
VALVE,BUTTERFLY
Possible match (shared part number)Dover Resources, Inc. Div Norriseal
4820-01-160-35974R1020-43AA-1FMPOSSIBLE MATCH
VALVE,BUTTERFLY
Possible match (shared part number)Dover Resources, Inc. Div Norriseal
4820-01-182-24895IN R1020-43AA-1FMPOSSIBLE MATCH
VALVE,BUTTERFLY
Possible match (shared part number)Norriseal Norris Values Div Dba Dover Co
3040-01-467-820291-1420-1POSSIBLE MATCH
CONNECTING LINK,RIGID
Possible match (shared part number)Grimes Aerospace Company
NSN 4820-01-149-4963 is a Valve,butterfly, manufactured by Dover Resources, Inc. Div Norriseal, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-149-4963?
NSN 4820-01-149-4963 has 2 manufacturer part numbers on file: 3IN R1020-43AA-1FM (Dover Resources, Inc. Div Norriseal), 911E420 (Dover Resources, Inc. Div Norriseal).
What NSN replaces 4820-01-149-4963?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-149-5070, 4820-01-155-7751, 4820-01-160-3597. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-149-4963 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.