The Seat,valve, cataloged under National Stock Number 4820-01-350-8729, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-350-8729 |
| Primary Part Number | 211055787 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Body Outside Diameter | 3.090 INCHES NOMINAL IN |
| Body Inside Diameter | 2.040 INCHES NOMINAL IN |
| Material | PLASTIC ACETAL OVERALL |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| DF330644 FIND 168 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 801-6408784 FIND 168 | Naval Sea Systems Command (USA) |
| 211055787 PRIMARY | Naval Sea Systems Command (USA) |
NSN 4820-01-350-8729 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-350-8729 has 3 manufacturer part numbers on file: DF330644 FIND 168 (Huntington Ingalls Inc Div Newport News Shipbuilding), 801-6408784 FIND 168 (Naval Sea Systems Command), 211055787 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-529-2981. Verify interchangeability with system specifications before substitution.
Key specifications for 211055787: Overall Height: 0.396 INCHES NOMINAL IN; Body Outside Diameter: 3.090 INCHES NOMINAL IN; Body Inside Diameter: 2.040 INCHES NOMINAL IN; Material: PLASTIC ACETAL OVERALL. 4 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.
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.