PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

263A 1-4 3-50Valve,regulating,fluid Pressure

Watts Regulator Company · NSN 4820-00-988-4127 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-988-4127 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-988-4127. Primary manufacturer part number: 263A 1-4 3-50.
Features
  • Valve,regulating,fluid Pressure — FSC 4820
  • 7 verified cross-references
  • Primary manufacturer: Watts Regulator Company
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,regulating,fluid Pressure, cataloged under National Stock Number 4820-00-988-4127, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Watts Regulator Company. This item has 7 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Catalog Facts
Item NameValve,regulating,fluid Pressure
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersWatts Regulator Company (CAGE 79227); Electro Impulse Laboratory Inc Dba Electro Impulse Inc (CAGE 91161)
Technical Specifications
ParameterValue
NSN4820-00-988-4127
Primary Part Number263A 1-4 3-50
Item NameValve,regulating,fluid Pressure
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerWatts Regulator Company
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 10
5935-00-005-961323A INTERCHANGEABLE
Connector,receptacle,electrical
Lpa Industries Ltd
6625-00-051-2787 INTERCHANGEABLE
Test Set,ground Res
6220-00-152-7114 INTERCHANGEABLE
Lens,light
5315-00-425-1642 INTERCHANGEABLE
Pin,straight,headed
4320-00-432-159623A INTERCHANGEABLE
Coupling,pump
Grundfos Cbs, Inc Dba Paco Pumps
4820-00-541-27566010EEV01-KM0065 INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Dba Marine Product Team Div Marine Product Team
5950-00-646-386551102-300 INTERCHANGEABLE
Saturable Reactor
Safran Power Usa Llc
8340-00-951-0990 INTERCHANGEABLE
Segment,tent Frame Arch
5340-01-015-96471023A INTERCHANGEABLE
Key Blank
Ilco Unican Corp Dba Wolf Sales
4520-01-281-0862 INTERCHANGEABLE
Heating Element,electrical,nonim
Cross-Reference Index
Part NumberManufacturer
N26A Watts Regulator Company (USA)
263A 1-4 3-50 PRIMARY Watts Regulator Company (USA)
N263-2-1-4-3-50 Watts Regulator Company (USA)
N26-3-50PSI Watts Regulator Company (USA)
263A PRIMARY Watts Regulator Company (USA)
C12898 Electro Impulse Laboratory Inc Dba Electro Impulse Inc (USA)
23A Watts Regulator Company (USA)
Related Parts
5935-00-005-9613INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
23A
6625-00-051-2787INTERCHANGEABLE
TEST SET,GROUND RES
6220-00-152-7114INTERCHANGEABLE
LENS,LIGHT
5315-00-425-1642INTERCHANGEABLE
PIN,STRAIGHT,HEADED
4320-00-432-1596INTERCHANGEABLE
COUPLING,PUMP
23A
4820-00-541-2756INTERCHANGEABLE
VALVE,SAFETY RELIEF
6010EEV01-KM0065
5950-00-646-3865INTERCHANGEABLE
SATURABLE REACTOR
51102-300
8340-00-951-0990INTERCHANGEABLE
SEGMENT,TENT FRAME ARCH
5340-01-015-9647INTERCHANGEABLE
KEY BLANK
1023A
4520-01-281-0862INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM

Frequently Asked Questions

What is NSN 4820-00-988-4127?

NSN 4820-00-988-4127 is a Valve,regulating,fluid Pressure, manufactured by Watts Regulator Company, classified under FSC 4820 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4820-00-988-4127?

NSN 4820-00-988-4127 has 7 cross-referenced part numbers: N26A (Watts Regulator Company), 263A 1-4 3-50 (Watts Regulator Company), N263-2-1-4-3-50 (Watts Regulator Company), N26-3-50PSI (Watts Regulator Company), 263A (Watts Regulator Company) and 2 more.

What NSN replaces 4820-00-988-4127?

There are 10 known substitutes for 4820-00-988-4127: 5935-00-005-9613, 6625-00-051-2787, 6220-00-152-7114 and 7 more. Verify interchangeability with system specifications before substitution.

Is NSN 4820-00-988-4127 still in active supply?

NSN 4820-00-988-4127 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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