The Glass,liquid Sight Indicator,fla, cataloged under National Stock Number 6680-01-646-9580, 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. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Glass,liquid Sight Indicator,fla |
| FSC / FSG | 6680 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments (FSG 66) |
| Manufacturers | Clark-Reliance Llc (CAGE 007F8) |
| Parameter | Value |
|---|---|
| NSN | 6680-01-646-9580 |
| Primary Part Number | TBC-18-B |
| 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 |
| 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 |
|---|---|
| TBC-18-B PRIMARY | Clark-Reliance Llc (USA) |
| Reference | Meaning |
|---|---|
| TMS-7690 | 5/2 Secondary reference U.S. Government activity |
| CMS-1802-1-1/2-PC 5 | 5/2 Secondary reference U.S. Government activity |
NSN 6680-01-646-9580 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 6680-01-646-9580 has 1 manufacturer part number on file: TBC-18-B (Clark-Reliance Llc).
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.