The Indicator,sight,liquid, cataloged under National Stock Number 6680-01-508-3971, 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 Federal Resources Supply Company, Llc. Government technical data includes 8 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-01-508-3971 |
| Primary Part Number | SFI-3211 |
| Item Name | Indicator,sight,liquid |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Federal Resources Supply Company, Llc |
| Status | ACTIVE |
| Furnished Data | LIQUID FLOW |
| Nominal Pipe Size for Which Designed | UNABLE TO DECODE |
| End Connection Type | UNABLE TO DECODE |
| Style Designator | DOUBLE PORT |
| Maximum Working Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) LBS |
| Material | COPPER ALLOY AND STEEL CORROSION RESISTING |
| Thread Series Designator | UNABLE TO DECODE |
| Sight Diameter | 3.750 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 |
|---|---|
| SFI-3211 PRIMARY | Federal Resources Supply Company, Llc (USA) |
NSN 6680-01-508-3971 is a Indicator,sight,liquid, manufactured by Federal Resources Supply Company, Llc, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-508-3971 has 1 manufacturer part number on file: SFI-3211 (Federal Resources Supply Company, Llc).
Key specifications for SFI-3211: Overall Height: 8.500 INCHES NOMINAL IN; Furnished Data: LIQUID FLOW; Nominal Pipe Size for Which Designed: UNABLE TO DECODE; End Connection Type: UNABLE TO DECODE. 8 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.