The Valve,vent, cataloged under National Stock Number 4820-01-684-9597, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Multiplex Mfg Co Inc. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-684-9597 |
| Primary Part Number | D434G00UX20-2 |
| Item Name | Valve,vent |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Multiplex Mfg Co Inc |
| Status | ACTIVE |
| Connection Style | PLAIN (PIPE) ALL ENDS |
| Nominal Length | 13.625 INCHES ALL ENDS IN |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Operating Pressure | 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 2.00 INCHES IN |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 2.00 INCHES ALL ENDS IN |
| Nominal Outside Diameter | 10.125 INCHES ALL ENDS IN |
| Face to Face Distance | 10.941 INCHES IN |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Material | STEEL COMP 316 BODY |
| Thread Series Designator | NPT ALL ENDS |
| 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 |
|---|---|
| D434G00UX20-2 PRIMARY | Multiplex Mfg Co Inc (USA) |
| Reference | Meaning |
|---|---|
| UX20-2 | D/9 Drawing number reference only Multiplex Mfg Co Inc |
NSN 4820-01-684-9597 is a Valve,vent, manufactured by Multiplex Mfg Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-684-9597 has 1 manufacturer part number on file: D434G00UX20-2 (Multiplex Mfg Co Inc).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-685-8190, 4820-01-685-8666. Verify interchangeability with system specifications before substitution.
Key specifications for D434G00UX20-2: Connection Style: PLAIN (PIPE) ALL ENDS; Nominal Length: 13.625 INCHES ALL ENDS IN; Connection Type: THREADED INTERNAL PIPE ALL ENDS; Operating Pressure: 200.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. 12 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.