The Glass,liquid Sight Indicator,fla, cataloged under National Stock Number 6680-01-491-9485, 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of the Instruments and Laboratory Equipment group. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6680-01-491-9485 |
| Item Name | Glass,liquid Sight Indicator,fla |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| 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 |
| Reference | Meaning |
|---|---|
| 2D7529 REV D | D/9 Drawing number reference only U.S. Government activity |
| 2D7529 | 3/2 Design control — primary reference U.S. Government activity |
NSN 6680-01-491-9485 is a Glass,liquid Sight Indicator,fla, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6680-01-492-9689. Verify interchangeability with system specifications before substitution.
Key specifications for 6680-01-491-9485: Special Features: LENS MATERIAL, BOROSOLICATE GLASS; OPERATING TEMP MINUS 65 DEGREES F TO PLUS 250 DEGREES F; INTERNAL PRESSURE 5 PSI MAX; HOUSING MATERIAL MAG ALY; Part Name Assigned by Controlling Agency: SIGHT GLASS,OIL LEVEL; End Item Identification: LIQUID SIGHT INDICATOR. 0 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.