NSN 4820-01-426-3374 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-426-3374. Manufacturer of record part number: 27M-144A.
The Stem,fluid Valve, cataloged under National Stock Number 4820-01-426-3374, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Metrex Valve Corp. Dba Metrex Valve Corp. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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.
Technical Specifications
Parameter
Value
NSN
4820-01-426-3374
Primary Part Number
27M-144A
Item Name
Stem,fluid Valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Metrex Valve Corp. Dba Metrex Valve Corp
Status
ACTIVE
Valve Type for Which Designed
REGULATOR
Stem Actuating End Type
THREADED INTERNALLY
Material Document and Classification
QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE
Valve Size for Which Designed
4.000 INCHES IN
Material
NICKEL AND COPPER ALLOY
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.
4820-01-426-337529M-120APOSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Metrex Valve Corp. Dba Metrex Valve Corp
4820-01-428-170031M-48BPOSSIBLE MATCH
DIAPHRAGM,ACTUATOR VALVE,SPECIAL
Possible match (shared part number)Metrex Valve Corp. Dba Metrex Valve Corp
4820-01-428-170745M-492APOSSIBLE MATCH
PLUG,ROTARY,VALVE
Possible match (shared part number)Metrex Valve Corp. Dba Metrex Valve Corp
4820-01-428-178627M-186APOSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Metrex Valve Corp. Dba Metrex Valve Corp
4820-01-428-1788MM3130B1TC11MPOSSIBLE MATCH
VALVE,SAFETY RELIEF
Possible match (shared part number)Metrex Valve Corp. Dba Metrex Valve Corp
4820-01-428-233945M-392POSSIBLE MATCH
CYLINDER,DIAPHRAGM,VALVE PILOT
Possible match (shared part number)Metrex Valve Corp. Dba Metrex Valve Corp
NSN 4820-01-426-3374 is a Stem,fluid Valve, manufactured by Metrex Valve Corp. Dba Metrex Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-426-3374?
NSN 4820-01-426-3374 has 1 manufacturer part number on file: 27M-144A (Metrex Valve Corp. Dba Metrex Valve Corp).
What NSN replaces 4820-01-426-3374?
6 possible matches (shared part number, not a government interchangeability claim): 4820-01-426-3375, 4820-01-428-1700, 4820-01-428-1707. Verify interchangeability with system specifications before substitution.
What are the specifications of 27M-144A?
Key specifications for 27M-144A: Valve Type for Which Designed: REGULATOR; Stem Actuating End Type: THREADED INTERNALLY; Material Document and Classification: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE; Valve Size for Which Designed: 4.000 INCHES IN. 5 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-426-3374 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.