The Regulator,thermostatic Temperatu, cataloged under National Stock Number 4820-01-434-2038, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Goodrich Corporation. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Regulator,thermostatic Temperatu |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Goodrich Corporation (CAGE 0AJJ0) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-434-2038 |
| Primary Part Number | 691-21A |
| Item Name | Regulator,thermostatic Temperatu |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Goodrich Corporation |
| Status | ACTIVE |
| Thermostat Type | COIL SPRING BIMETALLIC |
| Usage Design | SUCTION RELIEF |
| Thread Size and Series/type Designator | 0.562-18 UNF |
| 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 |
|---|---|
| 691-21A PRIMARY | Goodrich Corporation (USA) |
| Reference | Meaning |
|---|---|
| Z00.N6045807223TBM | 5/9 Secondary reference Daher Aerospace - Ex Socata |
NSN 4820-01-434-2038 is a Regulator,thermostatic Temperatu, manufactured by Goodrich Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-434-2038 has 1 manufacturer part number on file: 691-21A (Goodrich Corporation).
Key specifications for 691-21A: Thermostat Type: COIL SPRING BIMETALLIC; Special Features: SET RANGE 4 TO 7 IN HG IN; Usage Design: SUCTION RELIEF; Thread Size and Series/type Designator: 0.562-18 UNF. 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.
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.