The Seat,valve, cataloged under National Stock Number 4820-01-337-7258, 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 3 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. 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 | 4820-01-337-7258 |
| Primary Part Number | 211033288 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Body Outside Diameter | 14.465 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 21.500 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 211033288 PRIMARY | Naval Sea Systems Command (USA) |
| 801-6405354 FIND 35 | Naval Sea Systems Command (USA) |
NSN 4820-01-337-7258 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-337-7258 has 2 manufacturer part numbers on file: 211033288 (Naval Sea Systems Command), 801-6405354 FIND 35 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-618-0761. Verify interchangeability with system specifications before substitution.
Key specifications for 211033288: Overall Height: 1.531 INCHES NOMINAL IN; Body Outside Diameter: 14.465 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 21.500 INCHES NOMINAL IN. 3 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 4820-01-337-7258 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.