The Indicator,valve Opening, cataloged under National Stock Number 4820-01-344-0370, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-344-0370 |
| Primary Part Number | DF330645 FIND 27 |
| Item Name | Indicator,valve Opening |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Individual Marking | OPEN;BLEED;SHUT |
| Mounting Facility Type and Quantity | 2 THREADED HOLE(S) |
| Mounting Arrangement Style | TWO HOLE/STUD |
| Scale Marking | LETTERS |
| Mounting Hole Diameter | 0.275 INCHES NOMINAL IN |
| Scale Marking Transparency | NONLUMINOUS |
| Distance Between Mounting Facility Centers | 1.875 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING CASE |
| 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 |
|---|---|
| 211055149 | Naval Sea Systems Command (USA) |
| DF330645 FIND 27 PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 801-6408785 FIND 27 | Naval Sea Systems Command (USA) |
| DF330645 FIND 27 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| DF330645 | D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding |
| 801-6408785 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-344-0370 is a Indicator,valve Opening, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-344-0370 has 4 manufacturer part numbers on file: 211055149 (Naval Sea Systems Command), DF330645 FIND 27 (Huntington Ingalls Inc Div Newport News Shipbuilding), 801-6408785 FIND 27 (Naval Sea Systems Command), DF330645 FIND 27 (Naval Sea Systems Command).
4 possible matches (shared part number, not a government interchangeability claim): 5355-01-368-6810, 4810-01-371-1410, 4820-01-483-1555. Verify interchangeability with system specifications before substitution.
Key specifications for DF330645 FIND 27: Individual Marking: OPEN;BLEED;SHUT; Mounting Facility Type and Quantity: 2 THREADED HOLE(S); Mounting Arrangement Style: TWO HOLE/STUD; Scale Marking: LETTERS. 8 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.