PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

408575Seat,valve

Leslie Controls, Inc. Dba Leslie Controls Inc · NSN 4820-01-321-6441 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-321-6441 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-321-6441. Primary manufacturer part number: 408575.
Features
  • Seat,valve — FSC 4820
  • Material: PLASTIC POLYTETRAFLUOROETHYLENE OVERALL
  • 3 verified cross-references
  • Primary manufacturer: Leslie Controls, Inc. Dba Leslie Controls Inc
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Plastic Polytetrafluoroethylene Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-321-6441, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-321-6441
Primary Part Number408575
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerLeslie Controls, Inc. Dba Leslie Controls Inc
StatusACTIVE
MaterialPLASTIC POLYTETRAFLUOROETHYLENE OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5945-00-256-066632-76129-75 INTERCHANGEABLE
Relay,electromagnetic
The Boeing Company Div Defense
2530-00-529-4029 INTERCHANGEABLE
Brake Lining Kit
4820-01-320-8253408690 INTERCHANGEABLE
Seat,valve
Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-320-88582498-00-257 30IN VALVE ONLY INTERCHANGEABLE
Valve,butterfly
Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-320-8893408799 INTERCHANGEABLE
Stem,fluid Valve
Leslie Controls, Inc. Dba Leslie Controls Inc
3120-01-321-2086408617 INTERCHANGEABLE
Bushing,sleeve
Leslie Controls, Inc. Dba Leslie Controls Inc
4820-01-321-6341408815 INTERCHANGEABLE
Stem,fluid Valve
Leslie Controls, Inc. Dba Leslie Controls Inc
Cross-Reference Index
Part NumberManufacturer
408575 Circor Intl Inc (USA)
408575 PRIMARY Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
2498-00-257 Circor Intl Inc (USA)
Related Parts
5945-00-256-0666INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
32-76129-75
2530-00-529-4029INTERCHANGEABLE
BRAKE LINING KIT
4820-01-320-8253INTERCHANGEABLE
SEAT,VALVE
408690
4820-01-320-8858INTERCHANGEABLE
VALVE,BUTTERFLY
2498-00-257 30IN VALVE ONLY
4820-01-320-8893INTERCHANGEABLE
STEM,FLUID VALVE
408799
3120-01-321-2086INTERCHANGEABLE
BUSHING,SLEEVE
408617
4820-01-321-6341INTERCHANGEABLE
STEM,FLUID VALVE
408815

Frequently Asked Questions

What is NSN 4820-01-321-6441?

NSN 4820-01-321-6441 is a Seat,valve, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-321-6441?

NSN 4820-01-321-6441 has 3 cross-referenced part numbers: 408575 (Circor Intl Inc), 408575 (Leslie Controls, Inc. Dba Leslie Controls Inc), 2498-00-257 (Circor Intl Inc).

What NSN replaces 4820-01-321-6441?

There are 7 known substitutes for 4820-01-321-6441: 5945-00-256-0666, 2530-00-529-4029, 4820-01-320-8253 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 408575?

Key specifications for 408575: Material: PLASTIC POLYTETRAFLUOROETHYLENE OVERALL. 1 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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