PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

2941-00Piston,valve

Lawler Manufacturing Company, Inc. · NSN 4820-01-056-6838 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-056-6838 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-056-6838. Primary manufacturer part number: 2941-00.
Features
  • Piston,valve — FSC 4820
  • Valve Type for Which Designed: PRESSURE REDUCING
  • Inside Diameter: 2.250 INCHES NOMINAL IN
  • Valve Model Number for Which Designed: STYL S
  • Valve Design Control Activity: 75545
  • Material: COPPER ALLOY
  • Outside Diameter: 2.617 INCHES NOMINAL IN
  • Valve Size for Which Designed: 2.500 INCHES IN
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Copper Alloy construction
General Description

The Piston,valve, cataloged under National Stock Number 4820-01-056-6838, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Lawler Manufacturing Company, Inc.. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-056-6838
Primary Part Number2941-00
Item NamePiston,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerLawler Manufacturing Company, Inc.
StatusACTIVE
Valve Type for Which DesignedPRESSURE REDUCING
Inside Diameter2.250 INCHES NOMINAL IN
Valve Model Number for Which DesignedSTYL S
Valve Design Control Activity75545
MaterialCOPPER ALLOY
Outside Diameter2.617 INCHES NOMINAL IN
Valve Size for Which Designed2.500 INCHES IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4920-00-067-81762941 INTERCHANGEABLE
Bar,pair-Blade Positioner
Marvel Manufacturing Co Div the Marvel Manufacturing Company
4820-00-202-6367 INTERCHANGEABLE
Disk,valve
5831-00-323-0231294-100 INTERCHANGEABLE
Control Box
Melstrom Manufacturing Corporation
5305-00-626-43026264302 INTERCHANGEABLE
Thumbscrew
U S Army Tank Automotive Command Amsta-Im-Mm
5950-00-767-9265X24372 INTERCHANGEABLE
Transformer,power
L3harris Technologies, Inc. Div Space and Airborne Systems
5935-00-827-347554B7000H01 INTERCHANGEABLE
Connector,receptacle,electrical
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
2530-00-904-25212525069 INTERCHANGEABLE
Parts Kit,hydraulic Brake Master
Chrysler Realty Company Llc Dba Daimler Chrysler
4820-01-093-08641539 INTERCHANGEABLE
Seat,valve
Lawler Manufacturing Company, Inc.
4820-01-093-2807992D PIECE 27 INTERCHANGEABLE
Stem,fluid Valve
Lawler Manufacturing Company, Inc.
4820-01-093-6476545 INTERCHANGEABLE
Wheel Adjustment,valve
Lawler Manufacturing Company, Inc.
Cross-Reference Index
Part NumberManufacturer
992-D-21 Lawler Manufacturing Company, Inc. (USA)
2941 Lawler Manufacturing Company, Inc. (USA)
2941-00 PRIMARY Lawler Manufacturing Company, Inc. (USA)
992-D Lawler Manufacturing Company, Inc. (USA)
Related Parts
4920-00-067-8176INTERCHANGEABLE
BAR,PAIR-BLADE POSITIONER
2941
4820-00-202-6367INTERCHANGEABLE
DISK,VALVE
5831-00-323-0231INTERCHANGEABLE
CONTROL BOX
294-100
5305-00-626-4302INTERCHANGEABLE
THUMBSCREW
6264302
5950-00-767-9265INTERCHANGEABLE
TRANSFORMER,POWER
X24372
5935-00-827-3475INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
54B7000H01
2530-00-904-2521INTERCHANGEABLE
PARTS KIT,HYDRAULIC BRAKE MASTER
2525069
4820-01-093-0864INTERCHANGEABLE
SEAT,VALVE
1539
4820-01-093-2807INTERCHANGEABLE
STEM,FLUID VALVE
992D PIECE 27
4820-01-093-6476INTERCHANGEABLE
WHEEL ADJUSTMENT,VALVE
545
4730-01-093-6890INTERCHANGEABLE
PACKING NUT
992D PIECE 14A
4820-01-093-9078INTERCHANGEABLE
SEAT,VALVE
992D PIECE 22

Frequently Asked Questions

What is NSN 4820-01-056-6838?

NSN 4820-01-056-6838 is a Piston,valve, manufactured by Lawler Manufacturing Company, Inc., classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-056-6838?

NSN 4820-01-056-6838 has 4 cross-referenced part numbers: 992-D-21 (Lawler Manufacturing Company, Inc.), 2941 (Lawler Manufacturing Company, Inc.), 2941-00 (Lawler Manufacturing Company, Inc.), 992-D (Lawler Manufacturing Company, Inc.).

What NSN replaces 4820-01-056-6838?

There are 12 known substitutes for 4820-01-056-6838: 4920-00-067-8176, 4820-00-202-6367, 5831-00-323-0231 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 2941-00?

Key specifications for 2941-00: Valve Type for Which Designed: PRESSURE REDUCING; Inside Diameter: 2.250 INCHES NOMINAL IN; Overall Length: 2.000 INCHES NOMINAL IN; Valve Model Number for Which Designed: STYL S. 8 total characteristics are documented in the Federal Logistics Information System.

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