NSN 4820-01-121-1803 · NIIN 011211803 · Part number 4812-170
Mc Donald a Y Mfg Co · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 76243
Government record, cited
NSN 4820-01-121-1803 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-121-1803. Manufacturer of record part number: 4812-170.
The Valve,plug, cataloged under National Stock Number 4820-01-121-1803, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Mc Donald a Y Mfg Co. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares 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,plug
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Manufacturers
Mc Donald a Y Mfg Co (CAGE 76243)
Technical Specifications
Parameter
Value
NSN
4820-01-121-1803
Primary Part Number
4812-170
Item Name
Valve,plug
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Mc Donald a Y Mfg Co
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 Items1
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4320-01-400-31264812-170POSSIBLE MATCH
IMPELLER,PUMP,CENTRIFUGAL
Possible match (shared part number)Mag Aerospace Industries, Llc Div Safran Cabins
NSN 4820-01-121-1803 is a Valve,plug, manufactured by Mc Donald a Y Mfg Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-121-1803?
NSN 4820-01-121-1803 has 2 manufacturer part numbers on file: 4812-170 (Mc Donald a Y Mfg Co), 10687B (Mc Donald a Y Mfg Co).
What NSN replaces 4820-01-121-1803?
1 possible match (shared part number, not a government interchangeability claim): 4320-01-400-3126. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-121-1803 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.