PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

701591Seat,valve

Cat Pumps Corp · NSN 4820-01-656-2633 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-656-2633 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-656-2633. Primary manufacturer part number: 701591.
Features
  • Seat,valve — FSC 4820
  • Seating Surface Shape: O-RING
  • Style Designator: FAUCET
  • Material: ALUMINUM OVERALL
  • 1 verified cross-reference
  • Primary manufacturer: Cat Pumps Corp
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Aluminum Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-656-2633, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Cat Pumps Corp. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-656-2633
Primary Part Number701591
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerCat Pumps Corp
StatusACTIVE
Seating Surface ShapeO-RING
Style DesignatorFAUCET
MaterialALUMINUM OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5310-00-149-8528701591 INTERCHANGEABLE
Nut,plain,square
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
5998-00-858-120970159-1 INTERCHANGEABLE
Circuit Card Assembly
Bemsco Inc
1265-01-122-530912703367 INTERCHANGEABLE
Module Assembly
Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate
4130-01-251-685871003 INTERCHANGEABLE
Filter-Drier,refrigerant
M D Holdings Llc Dba Saniserv
Cross-Reference Index
Part NumberManufacturer
701591 PRIMARY Cat Pumps Corp (USA)
Related Parts
5310-00-149-8528INTERCHANGEABLE
NUT,PLAIN,SQUARE
701591
5998-00-858-1209INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
70159-1
1265-01-122-5309INTERCHANGEABLE
MODULE ASSEMBLY
12703367
4130-01-251-6858INTERCHANGEABLE
FILTER-DRIER,REFRIGERANT
71003

Frequently Asked Questions

What is NSN 4820-01-656-2633?

NSN 4820-01-656-2633 is a Seat,valve, manufactured by Cat Pumps Corp, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-656-2633?

NSN 4820-01-656-2633 has 1 cross-referenced part number: 701591 (Cat Pumps Corp).

What NSN replaces 4820-01-656-2633?

There are 4 known substitutes for 4820-01-656-2633: 5310-00-149-8528, 5998-00-858-1209, 1265-01-122-5309 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 701591?

Key specifications for 701591: Seating Surface Shape: O-RING; Style Designator: FAUCET; Material: ALUMINUM OVERALL. 3 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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