The Glass,liquid Sight Indicator,fla, cataloged under National Stock Number 6680-01-133-9045, 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. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-01-133-9045 |
| Item Name | Glass,liquid Sight Indicator,fla |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Status | ACTIVE |
| Design Type | PLAIN |
| Overall Diameter | 3.375 INCHES NOMINAL IN |
| Overall Thickness | 0.375 INCHES NOMINAL IN |
| Gage Rated Pressure | 75.0 POUNDS PER SQUARE INCH LBS |
| Mica Shield | NOT PROVIDED |
| Gasket | NOT INCLUDED |
| Usage Design | W/LIQUID SIGHT INDICATOR |
| 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 |
|---|---|
| E-57 | 5/9 Secondary reference Ernst Flow Industries |
| E-57 PIECE 3 | 5/9 Secondary reference Ernst Flow Industries |
| 214 | 3/9 Design control — primary reference Ernst Flow Industries |
NSN 6680-01-133-9045 is a Glass,liquid Sight Indicator,fla, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4310-01-311-5520, 5330-01-664-4489. Verify interchangeability with system specifications before substitution.
Key specifications for 6680-01-133-9045: Design Type: PLAIN; Overall Diameter: 3.375 INCHES NOMINAL IN; Overall Thickness: 0.375 INCHES NOMINAL IN; Gage Rated Pressure: 75.0 POUNDS PER SQUARE INCH LBS. 7 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.