The Indicator,sight,liquid, cataloged under National Stock Number 6680-01-267-2168, is classified within Federal Supply Class 6680 (Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Clark-Reliance Llc. Government technical data includes 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-01-267-2168 |
| Primary Part Number | EFI-540-S 1-1/4 BRASS |
| Item Name | Indicator,sight,liquid |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Clark-Reliance Llc |
| Status | ACTIVE |
| Width Across Flats | 1.880 INCHES NOMINAL IN |
| Data Furnishing Method | CLEAR WINDOW |
| Style Designator | BULLS EYE |
| Thread Direction | UNABLE TO DECODE |
| Nominal Thread Size | UNABLE TO DECODE |
| Thread Quantity Per Inch | UNABLE TO DECODE |
| Material | COPPER ALLOY |
| Thread Series Designator | UNABLE TO DECODE |
| Sight Diameter | 1.250 INCHES NOMINAL IN |
| 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 |
|---|---|
| EFI-540-S 1-1/4 BRASS | Clark-Reliance Llc (USA) |
| Reference | Meaning |
|---|---|
| EFI-540-S 1-1/4 BRASS | 3/9 Design control — primary reference Ernst Flow Industries |
| 31-15-2886 | 1/2 Source control — Government-approved source U.S. Government activity |
| E-540-S | 5/9 Secondary reference Goodyear Aerospace Corp Industrial Brake Opns |
NSN 6680-01-267-2168 is a Indicator,sight,liquid, manufactured by Clark-Reliance Llc, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-267-2168 has 1 manufacturer part number on file: EFI-540-S 1-1/4 BRASS (Clark-Reliance Llc).
Key specifications for EFI-540-S 1-1/4 BRASS: Overall Height: 1.250 INCHES NOMINAL IN; Width Across Flats: 1.880 INCHES NOMINAL IN; Data Furnishing Method: CLEAR WINDOW; Style Designator: BULLS EYE. 9 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.