The Tube Bundle,fluid H, cataloged under National Stock Number 4420-01-018-7904, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Tube Bundle,fluid H |
| FSC / FSG | 4420 — Heat Exchangers and Steam Condensers (FSG 44) |
| Parameter | Value |
|---|---|
| NSN | 4420-01-018-7904 |
| Item Name | Tube Bundle,fluid H |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Reference | Meaning |
|---|---|
| 534-8556 | 5/9 Secondary reference Aqua-Chem, Inc. |
| 534D8555D | 5/9 Secondary reference Aqua-Chem, Inc. |
| 534C8555 | C/1 Advisory reference — outside the item-of-supply concept Aqua-Chem, Inc. |
| 534-08555-000 | C/1 Advisory reference — outside the item-of-supply concept Aqua-Chem, Inc. Dba Aqua-Chem Inc |
| 534-08555-000 | 3/9 Design control — primary reference Aqua-Chem, Inc. |
NSN 4420-01-018-7904 is a Tube Bundle,fluid H, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4420-01-058-1748. 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.