The Valve,expansion, cataloged under National Stock Number 4820-01-661-9369, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Marvin Land Systems, Inc.. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-661-9369 |
| Primary Part Number | SE 2503 |
| Item Name | Valve,expansion |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Marvin Land Systems, Inc. |
| Status | ACTIVE |
| First End Thread Series Designator | UNF |
| First End Thread Direction | RIGHT-HAND |
| Second End Nominal Thread Size | 0.750 INCHES IN |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS |
| First End Style Designator | PLAIN |
| First Connection Face to Centerline Distance | 1.30 INCHES NOMINAL IN |
| Second End Thread Series Designator | UNF |
| Second End Thread Direction | RIGHT-HAND |
| Second Connection Face to Centerline Distance | 1.30 INCHES NOMINAL IN |
| Second End Style Designator | PLAIN |
| First End Connection Type | THREADED EXTERNAL TUBE |
| Second End Connection Type | THREADED EXTERNAL TUBE |
| First End Nominal Thread Size | 0.6250 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4820-01-661-9369 is a Valve,expansion, manufactured by Marvin Land Systems, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-661-9369 has 2 manufacturer part numbers on file: 13502546 (Marvin Land Systems, Inc.), SE 2503 (Marvin Land Systems, Inc.).
Key specifications for SE 2503: First End Thread Series Designator: UNF; First End Thread Direction: RIGHT-HAND; Second End Nominal Thread Size: 0.750 INCHES IN; Second End Relationship with First End: NOT IDENTICAL. 14 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.