PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B-9878-2Cap,valve

The Walworth Company · NSN 4820-01-108-8662 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-108-8662 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-108-8662. Primary manufacturer part number: B-9878-2.
Features
  • Cap,valve — FSC 4820
  • Valve Size for Which Designed: 5.000 INCHES IN
  • Material: STEEL
  • 5 verified cross-references
  • Primary manufacturer: The Walworth Company
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel construction
General Description

The Cap,valve, cataloged under National Stock Number 4820-01-108-8662, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is The Walworth Company. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 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
NSN4820-01-108-8662
Primary Part NumberB-9878-2
Item NameCap,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerThe Walworth Company
StatusACTIVE
Valve Size for Which Designed5.000 INCHES IN
MaterialSTEEL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
4820-01-058-23491889561PC41X42X44X45 INTERCHANGEABLE
Stem and Disk Assembly
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-116-68682620-922X1ASSYGS4IN PIECE 38 INTERCHANGEABLE
Cap,valve
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-116-7681700736033 INTERCHANGEABLE
Cap,valve
The Walworth Company
4820-01-123-41322620-922X1 PC 5/3 INCH INTERCHANGEABLE
Disk,valve
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-125-2152845-1889550ASSY5INCH PIECE INTERCHANGEABLE
Yoke,valve
The Walworth Company
4820-01-132-9148615842 INTERCHANGEABLE
Cap,valve
The Walworth Company
4820-01-201-67330605453 INTERCHANGEABLE
Clamp,bonnet
The Walworth Company
Cross-Reference Index
Part NumberManufacturer
845-1889550 Naval Ship Systems Command (USA)
2620-922X1ASSYGS5IN PIECE37 Electric Boat Corporation Div General Dynamics Electric Boat (USA)
B-9878-2 PRIMARY The Walworth Company (USA)
845-1889550ASSYGS5IN PIECE37 PRIMARY Naval Ship Systems Command (USA)
2620-922X1ASSYGS5IN PIECE37 The Walworth Company (USA)
Related Parts
4820-01-058-2349INTERCHANGEABLE
STEM AND DISK ASSEMBLY
1889561PC41X42X44X45
4820-01-116-6868INTERCHANGEABLE
CAP,VALVE
2620-922X1ASSYGS4IN PIECE 38
4820-01-116-7681INTERCHANGEABLE
CAP,VALVE
700736033
4820-01-123-4132INTERCHANGEABLE
DISK,VALVE
2620-922X1 PC 5/3 INCH
4820-01-125-2152INTERCHANGEABLE
YOKE,VALVE
845-1889550ASSY5INCH PIECE
4820-01-132-9148INTERCHANGEABLE
CAP,VALVE
615842
4820-01-201-6733INTERCHANGEABLE
CLAMP,BONNET
0605453

Frequently Asked Questions

What is NSN 4820-01-108-8662?

NSN 4820-01-108-8662 is a Cap,valve, manufactured by The Walworth Company, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-108-8662?

NSN 4820-01-108-8662 has 5 cross-referenced part numbers: 845-1889550 (Naval Ship Systems Command), 2620-922X1ASSYGS5IN PIECE37 (Electric Boat Corporation Div General Dynamics Electric Boat), B-9878-2 (The Walworth Company), 845-1889550ASSYGS5IN PIECE37 (Naval Ship Systems Command), 2620-922X1ASSYGS5IN PIECE37 (The Walworth Company).

What NSN replaces 4820-01-108-8662?

There are 7 known substitutes for 4820-01-108-8662: 4820-01-058-2349, 4820-01-116-6868, 4820-01-116-7681 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B-9878-2?

Key specifications for B-9878-2: Valve Size for Which Designed: 5.000 INCHES IN; Material: STEEL. 2 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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