The Heater,fluid,electric, cataloged under National Stock Number 4520-01-415-7391, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Cryoquip, Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | Heater,fluid,electric |
| FSC / FSG | 4520 — Space and Water Heating Equipment (FSG 45) |
| Manufacturers | Cryoquip, Llc (CAGE 7X733) |
| Parameter | Value |
|---|---|
| NSN | 4520-01-415-7391 |
| Primary Part Number | 331204 ITEM 3 |
| Item Name | Heater,fluid,electric |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Cryoquip, Llc |
| 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 |
|---|---|
| 181019-1 | Cryoquip, Llc (USA) |
| 331204 ITEM 3 PRIMARY | Cryoquip, Llc (USA) |
| Reference | Meaning |
|---|---|
| 331204 | D/9 Drawing number reference only Cryoquip, Llc |
NSN 4520-01-415-7391 is a Heater,fluid,electric, manufactured by Cryoquip, Llc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-415-7391 has 2 manufacturer part numbers on file: 181019-1 (Cryoquip, Llc), 331204 ITEM 3 (Cryoquip, Llc).
1 possible match (shared part number, not a government interchangeability claim): 3655-01-422-4512. 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.