NSN 4820-00-489-4904 · NIIN 004894904 · Part number 20WR21
Ross Valve Manufacturing Company, Inc. Div Ross Valve Mfg Co. · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 77653
Government record, cited
NSN 4820-00-489-4904 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-489-4904. Manufacturer of record part number: 20WR21.
Also searched as4820-00-489-4904 ·
4820004894904 ·
NIIN 004894904 ·
00-489-4904 ·
FSC 4820 Valves, Nonpowered · CAGE 77653 · 20WR21
Manufacturer of record: Ross Valve Manufacturing Company, Inc. Div Ross Valve Mfg Co.
Identification
NSN: 4820-00-489-4904
NIIN: 004894904
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 20WR21
Manufacturer: Ross Valve Manufacturing Company, Inc. Div Ross Valve Mfg Co.
General Description
The Disk,valve, cataloged under National Stock Number 4820-00-489-4904, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Ross Valve Manufacturing Company, Inc. Div Ross Valve Mfg Co.. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-00-489-4904
Primary Part Number
20WR21
Item Name
Disk,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Ross Valve Manufacturing Company, Inc. Div Ross Valve Mfg Co.
Ross Valve Manufacturing Company, Inc. Div Ross Valve Mfg Co. (USA)
No interchangeability data on file.
Other items in FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097
4820-00-000-0097 · Item name not on file
4820-00-001-0010
VALVE,ROTARY,SELECTOR
4820-00-001-0020
4820-00-001-0020 · Item name not on file
4820-00-001-0021
4820-00-001-0021 · Item name not on file
4820-00-001-0032
4820-00-001-0032 · Item name not on file
4820-00-001-0037
VALVE,SAFETY RELIEF
4820-00-001-0042
4820-00-001-0042 · Item name not on file
4820-00-001-1230
4820-00-001-1230 · Item name not on file
Frequently Asked Questions
What is NSN 4820-00-489-4904?
NSN 4820-00-489-4904 is a Disk,valve, manufactured by Ross Valve Manufacturing Company, Inc. Div Ross Valve Mfg Co., classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-00-489-4904?
NSN 4820-00-489-4904 has 1 manufacturer part number on file: 20WR21 (Ross Valve Manufacturing Company, Inc. Div Ross Valve Mfg Co.).
What are the specifications of 20WR21?
Key specifications for 20WR21: Overall Height: 0.188 INCHES NOMINAL IN; Outside Diameter: 2.250 INCHES NOMINAL IN; Style Designator: PLAIN; Inside Diameter: 1.094 INCHES NOMINAL IN. 4 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-489-4904 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.