NSN 4820-01-520-6739 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-520-6739. Manufacturer of record part number: 448-7575.
The Valve,check, cataloged under National Stock Number 4820-01-520-6739, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hiab Usa Inc. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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.
Technical Specifications
Parameter
Value
NSN
4820-01-520-6739
Primary Part Number
448-7575
Item Name
Valve,check
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Hiab Usa 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 Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
NSN 4820-01-520-6739 is a Valve,check, manufactured by Hiab Usa Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-520-6739?
NSN 4820-01-520-6739 has 3 manufacturer part numbers on file: 15012634 (Bae Systems Australia Limited), 4KK595 (Oshkosh Defense Llc), 448-7575 (Hiab Usa Inc).
What NSN replaces 4820-01-520-6739?
5 possible matches (shared part number, not a government interchangeability claim): 3040-01-520-8771, 5340-01-521-0217, 4320-01-521-0220. Verify interchangeability with system specifications before substitution.
What are the specifications of 448-7575?
Key specifications for 448-7575: Part Name Assigned by Controlling Agency: CHECK VALVE; End Item Identification: 2320-01-495-0110. 0 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-520-6739 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.