PartsTable TECHNICAL DATA SHEET

NSN 4820-01-172-2669Government record, cited

Valve, Vacuum Regulating4820-01-172-2669

NSN 4820-01-172-2669 · NIIN 011722669 · Part number 179999/818

Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 06481

Government record, cited

NSN 4820-01-172-2669 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-172-2669. Manufacturer of record part number: 179999/818.

Also searched as 4820-01-172-2669 · 4820011722669 · NIIN 011722669 · 01-172-2669 · FSC 4820 Valves, Nonpowered · CAGE 06481 · 179999/818 · 951-5088

Nearby stock numbers ← 4820-01-172-2668 Valve, Foot · 4820-01-172-2694 Valve, Regulating, Fluid Pressure →

4820-01-172-2669 — Valves, Nonpowered

Features

Valve,vacuum Regulating — FSC 4820
Second End Relationship with First End: IDENTICAL
First End Flange Outside Diameter: 2.750 INCHES NOMINAL IN
First End Style Designator: PLAIN
First End Bolt Hole Diameter: 0.265 INCHES NOMINAL IN
First End Bolt Circle Diameter: 2.312 INCHES NOMINAL IN
End Connection Quantity: 2
Body Material: STEEL CORROSION RESISTING

Identification

NSN: 4820-01-172-2669
NIIN: 011722669
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 179999/818
Manufacturer: Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp

General Description

The Valve,vacuum Regulating, cataloged under National Stock Number 4820-01-172-2669, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-172-2669
Primary Part Number	179999/818
Item Name	Valve,vacuum Regulating
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
Status	ACTIVE
Second End Relationship with First End	IDENTICAL
First End Flange Outside Diameter	2.750 INCHES NOMINAL IN
First End Style Designator	PLAIN
First End Bolt Hole Diameter	0.265 INCHES NOMINAL IN
First End Bolt Circle Diameter	2.312 INCHES NOMINAL IN
End Connection Quantity	2
Body Material	STEEL CORROSION RESISTING
First End Connection Type	PLAIN FACE FLANGE
Temp Adjustability	ADJUSTABLE
First End Flange Shape Style	ROUND W/ BOLT HOLES

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

Cross-Reference Index

Part Number	Manufacturer
179999/818 PRIMARY	Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA)

Reference documents

Reference	Meaning
951-5088	5/2 Secondary reference U.S. Government activity

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4820-00-000-0097

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-172-2669?

NSN 4820-01-172-2669 is a Valve,vacuum Regulating, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-172-2669?

NSN 4820-01-172-2669 has 1 manufacturer part number on file: 179999/818 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp).

What are the specifications of 179999/818?

Key specifications for 179999/818: Second End Relationship with First End: IDENTICAL; First End Flange Outside Diameter: 2.750 INCHES NOMINAL IN; First End Style Designator: PLAIN; First End Bolt Hole Diameter: 0.265 INCHES NOMINAL IN. 10 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-172-2669 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.

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