The Thermostat,flow Control, cataloged under National Stock Number 6685-01-210-5571, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is E. P. Barrus Limited Div Special Products. Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-210-5571 |
| Primary Part Number | 75692 |
| Item Name | Thermostat,flow Control |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | E. P. Barrus Limited Div Special Products |
| Status | ACTIVE |
| FSC Application Data | ENGINE |
| Operating Temp Rating | 143.0 FAHRENHEIT NOMINAL DEGF |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 75692 | E. P. Barrus Limited Div Special Products (GBR) |
| Reference | Meaning |
|---|---|
| 75692 | 3/2 Design control — primary reference U.S. Government activity |
| A-66850 | 5/9 Secondary reference U.S. Government activity |
NSN 6685-01-210-5571 is a Thermostat,flow Control, manufactured by E. P. Barrus Limited Div Special Products, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-210-5571 has 1 manufacturer part number on file: 75692 (E. P. Barrus Limited Div Special Products).
1 possible match (shared part number, not a government interchangeability claim): 4720-01-522-7795. Verify interchangeability with system specifications before substitution.
Key specifications for 75692: FSC Application Data: ENGINE; Operating Temp Rating: 143.0 FAHRENHEIT NOMINAL DEGF. 2 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.