The Glass,liquid Sight Indicator,fla, cataloged under National Stock Number 6680-01-548-6990, 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 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 6680-01-548-6990 |
| Primary Part Number | EMS-4881 |
| Item Name | Glass,liquid Sight Indicator,fla |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Clark-Reliance Llc |
| Status | ACTIVE |
| Design Type | PLAIN |
| Overall Diameter | 2.125 INCHES NOMINAL IN |
| Overall Thickness | 0.250 INCHES NOMINAL IN |
| Gage Rated Pressure | 200.0 POUNDS PER SQUARE INCH LBS |
| Mica Shield | NOT PROVIDED |
| Gasket | NOT INCLUDED |
| 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 |
|---|---|
| EMS-4881 PRIMARY | Clark-Reliance Llc (USA) |
| Reference | Meaning |
|---|---|
| E-57-3BZ-.50IN-PC4 | 3/9 Design control — primary reference Ernst Flow Industries |
NSN 6680-01-548-6990 is a Glass,liquid Sight Indicator,fla, manufactured by Clark-Reliance Llc, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-548-6990 has 1 manufacturer part number on file: EMS-4881 (Clark-Reliance Llc).
Key specifications for EMS-4881: Design Type: PLAIN; Overall Diameter: 2.125 INCHES NOMINAL IN; Overall Thickness: 0.250 INCHES NOMINAL IN; Gage Rated Pressure: 200.0 POUNDS PER SQUARE INCH LBS. 6 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.