PartsTable TECHNICAL DATA SHEET

NSN 4820-01-390-4886Government record, cited

Valve, Vacuum Breaking4820-01-390-4886

NSN 4820-01-390-4886 · NIIN 013904886 · Part number 4900BX

Alsons Corp · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 0XEF0

Government record, cited

NSN 4820-01-390-4886 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-390-4886. Manufacturer of record part number: 4900BX.

Also searched as 4820-01-390-4886 · 4820013904886 · NIIN 013904886 · 01-390-4886 · FSC 4820 Valves, Nonpowered · CAGE 0XEF0 · 4900BX · 141-319

Nearby stock numbers ← 4820-01-390-4866 · 4820-01-390-4892 Valve, Check →

4820-01-390-4886 — Valves, Nonpowered

Features

Valve,vacuum Breaking — FSC 4820
Face to Face Distance: 1.625 INCHES NOMINAL IN
Second End Nominal Pipe Size Accommodated: 0.500 INCHES IN
First End Nominal Pipe Size Accommodated: 0.500 INCHES IN
1 manufacturer part number on file
Manufacturer of record: Alsons Corp

Identification

NSN: 4820-01-390-4886
NIIN: 013904886
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 4900BX
Manufacturer: Alsons Corp

General Description

The Valve,vacuum Breaking, cataloged under National Stock Number 4820-01-390-4886, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Alsons Corp. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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	4820-01-390-4886
Primary Part Number	4900BX
Item Name	Valve,vacuum Breaking
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Alsons Corp
Status	ACTIVE
Face to Face Distance	1.625 INCHES NOMINAL IN
Second End Nominal Pipe Size Accommodated	0.500 INCHES IN
First End Nominal Pipe Size Accommodated	0.500 INCHES IN

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
4900BX	Alsons Corp (USA)

Reference documents

Reference	Meaning
141-319	3/9 Design control — primary 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 4820-01-390-4886?

NSN 4820-01-390-4886 is a Valve,vacuum Breaking, manufactured by Alsons Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-390-4886?

NSN 4820-01-390-4886 has 1 manufacturer part number on file: 4900BX (Alsons Corp).

What are the specifications of 4900BX?

Key specifications for 4900BX: Face to Face Distance: 1.625 INCHES NOMINAL IN; Second End Nominal Pipe Size Accommodated: 0.500 INCHES IN; End Item Identification: CDF DOMESTIC HOT WATER SYSTEM, SAINT JOHN SHIPBUILDING LTD; First End Nominal Pipe Size Accommodated: 0.500 INCHES IN. 3 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-390-4886 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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