The Indicator,sight,liquid, cataloged under National Stock Number 6680-01-688-2978, 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 Ldi Industries, Inc. Dba Ldi Industries Inc. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Indicator,sight,liquid |
| FSC / FSG | 6680 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments (FSG 66) |
| Manufacturers | Power Engineering and Manufacturing, Ltd. Dba Power Engineering & Manufacturing Ltd (CAGE 0CU54); Ldi Industries, Inc. Dba Ldi Industries Inc (CAGE 24346) |
| Parameter | Value |
|---|---|
| NSN | 6680-01-688-2978 |
| Primary Part Number | G635-05-A-3 |
| Item Name | Indicator,sight,liquid |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Ldi Industries, Inc. Dba Ldi Industries Inc |
| 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 |
|---|---|
| AD-43RH FIND NO 55 | Power Engineering and Manufacturing, Ltd. Dba Power Engineering & Manufacturing Ltd (USA) |
| G635-05-A-3 PRIMARY | Ldi Industries, Inc. Dba Ldi Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| AD-43-RH | D/9 Drawing number reference only Power Engineering and Manufacturing, Ltd. Dba Power Engineering & Manufacturing Ltd |
NSN 6680-01-688-2978 is a Indicator,sight,liquid, manufactured by Ldi Industries, Inc. Dba Ldi Industries Inc, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-688-2978 has 2 manufacturer part numbers on file: AD-43RH FIND NO 55 (Power Engineering and Manufacturing, Ltd. Dba Power Engineering & Manufacturing Ltd), G635-05-A-3 (Ldi Industries, Inc. Dba Ldi Industries Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5330-01-688-3389, 5330-01-688-3464, 5330-01-688-3467. Verify interchangeability with system specifications before substitution.
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.