The Valve,safety Relief, cataloged under National Stock Number 4820-00-481-3559, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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,safety Relief
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Technical Specifications
Parameter
Value
NSN
4820-00-481-3559
Item Name
Valve,safety Relief
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)
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4710-01-011-831825526POSSIBLE MATCH
TUBE ASSEMBLY,METAL
Possible match (shared part number)Williams International Co., L.l.c.
4720-01-128-45872010108-12-12-12-28.00POSSIBLE MATCH
HOSE ASSEMBLY,NONMETALLIC
Possible match (shared part number)Parker-Hannifin Corporation Dba Pneutronics Div Hose Products Division
3020-01-221-56971802245POSSIBLE MATCH
GEAR,SPUR
Possible match (shared part number)Northrop Grumman Systems Corporation
5355-01-417-912325526POSSIBLE MATCH
ADJUSTER,METER POINTER
Possible match (shared part number)Elbitamerica, Inc.
4440-01-709-1078POSSIBLE MATCH
DEHYDRATOR UNIT,NONREACTIVATING
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
25526
3/9Design control — primary reference
Bosch Automotive Service Solutions Inc.
Related Parts
4710-01-011-8318POSSIBLE MATCH
TUBE ASSEMBLY,METAL
25526
4720-01-128-4587POSSIBLE MATCH
HOSE ASSEMBLY,NONMETALLIC
2010108-12-12-12-28.00
3020-01-221-5697POSSIBLE MATCH
GEAR,SPUR
1802245
5355-01-417-9123POSSIBLE MATCH
ADJUSTER,METER POINTER
25526
4440-01-709-1078POSSIBLE MATCH
DEHYDRATOR UNIT,NONREACTIVATING
Frequently Asked Questions
What is NSN 4820-00-481-3559?
NSN 4820-00-481-3559 is a Valve,safety Relief, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-00-481-3559?
5 possible matches (shared part number, not a government interchangeability claim): 4710-01-011-8318, 4720-01-128-4587, 3020-01-221-5697. Verify interchangeability with system specifications before substitution.
Is NSN 4820-00-481-3559 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.