The Cock,plug, cataloged under National Stock Number 4820-00-090-0554, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Flagg Stanley G & Co Inc Dba Flagg Brass. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 4820-00-090-0554 |
| Primary Part Number | 20TF-3/4 |
| Item Name | Cock,plug |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Flagg Stanley G & Co Inc Dba Flagg Brass |
| Status | CANCELLED |
| Connection Style | PLAIN, OPTIONAL END (PIPE) ALL ENDS |
| Flow Style | TWO WAY TWO PORT 90 DEGREE PLUG TURN |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Material | COPPER ALLOY BODY |
| Thread Series Designator | NPT ALL ENDS |
| Valve Operation Method | MANUAL |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 560H5-3665 | Kurz & Root Generator Company, Llc (USA) |
| 20TF-3/4 PRIMARY | Flagg Stanley G & Co Inc Dba Flagg Brass (USA) |
| Reference | Meaning |
|---|---|
| 1260 3-4 | 5/9 Secondary reference U.S. Government activity |
| 4820000900554 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 04306-1064 | 5/9 Secondary reference U.S. Government activity |
| 70-1512 | D/9 Drawing number reference only Department of Defense Project Manager-Mobile Electric Power |
| 71-4859 | D/9 Drawing number reference only Department of Defense Project Manager-Mobile Electric Power |
| 11033 3/4 INCH | 5/9 Secondary reference Goddard Valve Corp |
| A400-4 | 5/9 Secondary reference Glauber Valve Co |
| 7000-3/4 INCH | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-090-0554 is a Cock,plug, manufactured by Flagg Stanley G & Co Inc Dba Flagg Brass, classified under FSC 4820, Valves, Nonpowered. Status: cancelled.
NSN 4820-00-090-0554 has 2 manufacturer part numbers on file: 560H5-3665 (Kurz & Root Generator Company, Llc), 20TF-3/4 (Flagg Stanley G & Co Inc Dba Flagg Brass).
7 possible matches (shared part number, not a government interchangeability claim): 6210-00-099-8620, 2910-00-105-3223, 2840-00-286-2505. Verify interchangeability with system specifications before substitution.
Key specifications for 20TF-3/4: Connection Style: PLAIN, OPTIONAL END (PIPE) ALL ENDS; Flow Style: TWO WAY TWO PORT 90 DEGREE PLUG TURN; Thread Direction: RIGHT-HAND ALL ENDS; Nominal Thread Size: 0.750 INCHES ALL ENDS IN. 7 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4820-00-090-0554 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.