PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20055406A/33A/SWS/1NMValve,vacuum Breaking

Griswold Industries Dba Cla-Val Co · NSN 4820-01-559-8875 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-559-8875 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-559-8875. Primary manufacturer part number: 20055406A/33A/SWS/1NM.
Features
  • Valve,vacuum Breaking — FSC 4820
  • 3 verified cross-references
  • Primary manufacturer: Griswold Industries Dba Cla-Val Co
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Valve,vacuum Breaking, cataloged under National Stock Number 4820-01-559-8875, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Griswold Industries Dba Cla-Val Co. This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameValve,vacuum Breaking
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersGriswold Industries Dba Cla-Val Co (CAGE 86184)
Technical Specifications
ParameterValue
NSN4820-01-559-8875
Primary Part Number20055406A/33A/SWS/1NM
Item NameValve,vacuum Breaking
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerGriswold Industries Dba Cla-Val Co
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5340-00-101-7560 INTERCHANGEABLE
Cover,access
4310-00-286-3315 INTERCHANGEABLE
Vacuum Pump Unit,diffusion and R
4730-00-288-9534389988PC360 INTERCHANGEABLE
Elbow,pipe
Naval Ship Systems Command
5945-00-556-714020360 INTERCHANGEABLE
Relay,thermal
Raytheon Company Dba Raytheon
5940-00-643-5314 INTERCHANGEABLE
Terminal Board
5325-00-810-57229986675-2 INTERCHANGEABLE
Stud,turnlock Fastener
Us Army Aviation and Missile Command
5342-01-195-8755 INTERCHANGEABLE
Cover
6515-01-356-3913203.310 INTERCHANGEABLE
Screw,bone,maxillofacial Surgery
Depuy Synthes Sales Inc Dba Depuy Synthes Trauma Div Depuy Synthes Sales, Inc., D/b/a Depuy Synthes Trauma
4820-01-487-316520360PS41SS INTERCHANGEABLE
Valve,safety Relief
Anderson Greenwood Lp Dba Anderson Greenwood Crosby
4730-01-597-123030344 INTERCHANGEABLE
Coupling,pipe
Allegheny Valve & Coupling, Inc. Dba Allegheny Coupling Company
Cross-Reference Index
Part NumberManufacturer
20360 PN 20055406A Griswold Industries Dba Cla-Val Co (USA)
20360 Griswold Industries Dba Cla-Val Co (USA)
20055406A/33A/SWS/1NM PRIMARY Griswold Industries Dba Cla-Val Co (USA)
Related Parts
5340-00-101-7560INTERCHANGEABLE
COVER,ACCESS
4310-00-286-3315INTERCHANGEABLE
VACUUM PUMP UNIT,DIFFUSION AND R
4730-00-288-9534INTERCHANGEABLE
ELBOW,PIPE
389988PC360
5945-00-556-7140INTERCHANGEABLE
RELAY,THERMAL
20360
5940-00-643-5314INTERCHANGEABLE
TERMINAL BOARD
5325-00-810-5722INTERCHANGEABLE
STUD,TURNLOCK FASTENER
9986675-2
5342-01-195-8755INTERCHANGEABLE
COVER
6515-01-356-3913INTERCHANGEABLE
SCREW,BONE,MAXILLOFACIAL SURGERY
203.310
4820-01-487-3165INTERCHANGEABLE
VALVE,SAFETY RELIEF
20360PS41SS
4730-01-597-1230INTERCHANGEABLE
COUPLING,PIPE
30344

Frequently Asked Questions

What is NSN 4820-01-559-8875?

NSN 4820-01-559-8875 is a Valve,vacuum Breaking, manufactured by Griswold Industries Dba Cla-Val Co, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-559-8875?

NSN 4820-01-559-8875 has 3 cross-referenced part numbers: 20360 PN 20055406A (Griswold Industries Dba Cla-Val Co), 20360 (Griswold Industries Dba Cla-Val Co), 20055406A/33A/SWS/1NM (Griswold Industries Dba Cla-Val Co).

What NSN replaces 4820-01-559-8875?

There are 10 known substitutes for 4820-01-559-8875: 5340-00-101-7560, 4310-00-286-3315, 4730-00-288-9534 and 7 more. Verify interchangeability with system specifications before substitution.

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