The Seat,valve, cataloged under National Stock Number 4820-00-653-2127, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Apd Cryogenics Inc. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-653-2127 |
| Primary Part Number | 239-9-350411 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Apd Cryogenics Inc |
| Status | ACTIVE |
| Body Outside Diameter | 0.375 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 0.176 INCHES NOMINAL IN |
| Material | PLASTIC OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 239-9-350411 PRIMARY | Apd Cryogenics Inc (USA) |
| Reference | Meaning |
|---|---|
| C319 | 5/9 Secondary reference Apd Cryogenics Inc |
NSN 4820-00-653-2127 is a Seat,valve, manufactured by Apd Cryogenics Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-653-2127 has 1 manufacturer part number on file: 239-9-350411 (Apd Cryogenics Inc).
1 possible match (shared part number, not a government interchangeability claim): 5315-01-031-0666. Verify interchangeability with system specifications before substitution.
Key specifications for 239-9-350411: Overall Height: 0.188 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN; Body Outside Diameter: 0.375 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN; Style Designator: PLAIN; Body Inside Diameter: 0.176 INCHES NOMINAL IN. 5 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.