NSN 4820-01-521-9533 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-521-9533. Manufacturer of record part number: Y109101009/CD35456N.
Manufacturer of record: Leslie Controls, Inc. Dba Leslie Controls Inc
Identification
NSN: 4820-01-521-9533
NIIN: 015219533
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: Y109101009/CD35456N
Manufacturer: Leslie Controls, Inc. Dba Leslie Controls Inc
General Description
The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-01-521-9533, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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,regulating,fluid Pressure
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Manufacturers
Leslie Controls, Inc. Dba Leslie Controls Inc (CAGE 35795)
Technical Specifications
Parameter
Value
NSN
4820-01-521-9533
Primary Part Number
Y109101009/CD35456N
Item Name
Valve,regulating,fluid Pressure
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Leslie Controls, Inc. Dba Leslie Controls Inc
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 Items6
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-521-9547A75136POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-521-9562A74072POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-521-9566A73650POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-521-9573A73227POSSIBLE MATCH
PISTON,VALVE
Possible match (shared part number)Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-521-9578A73389POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-521-9640A79146POSSIBLE MATCH
NUT,THRUST
Possible match (shared part number)Leslie Controls, Inc. Dba Leslie Controls Inc
Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
Reference documents
Reference
Meaning
Y109101009N
D/9Drawing number reference only
Leslie Controls, Inc. Dba Leslie Controls Inc
Related Parts
4820-01-521-9547POSSIBLE MATCH
STEM,FLUID VALVE
A75136
4820-01-521-9562POSSIBLE MATCH
SEAT,VALVE
A74072
4820-01-521-9566POSSIBLE MATCH
STEM,FLUID VALVE
A73650
4820-01-521-9573POSSIBLE MATCH
PISTON,VALVE
A73227
4820-01-521-9578POSSIBLE MATCH
STEM,FLUID VALVE
A73389
4820-01-521-9640POSSIBLE MATCH
NUT,THRUST
A79146
Frequently Asked Questions
What is NSN 4820-01-521-9533?
NSN 4820-01-521-9533 is a Valve,regulating,fluid Pressure, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-521-9533?
NSN 4820-01-521-9533 has 1 manufacturer part number on file: Y109101009/CD35456N (Leslie Controls, Inc. Dba Leslie Controls Inc).
What NSN replaces 4820-01-521-9533?
6 possible matches (shared part number, not a government interchangeability claim): 4820-01-521-9547, 4820-01-521-9562, 4820-01-521-9566. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-521-9533 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.