The Cover,control Box,heater, cataloged under National Stock Number 4520-01-423-4856, 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 Valad Electric Heating Corp.. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4520-01-423-4856 |
| Primary Part Number | DFMHLLM-7 |
| Item Name | Cover,control Box,heater |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Valad Electric Heating Corp. |
| Status | ACTIVE |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| DFMHLLM-7 PRIMARY | Valad Electric Heating Corp. (USA) |
| Reference | Meaning |
|---|---|
| 86-0623-7 | D/9 Drawing number reference only Valad Electric Heating Corp. |
NSN 4520-01-423-4856 is a Cover,control Box,heater, manufactured by Valad Electric Heating Corp., classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-423-4856 has 1 manufacturer part number on file: DFMHLLM-7 (Valad Electric Heating Corp.).
3 possible matches (shared part number, not a government interchangeability claim): 4520-01-423-4862, 4520-01-423-4886, 4520-01-423-5692. Verify interchangeability with system specifications before substitution.
Key specifications for DFMHLLM-7: End Item Identification: ELECTRIC CONVECTION HEATER;VALID ELECTRIC HEATING CORP;MODEL DFMH41.5-1NM;W/S STRATEGIC SEALIFT CONVERSION SHIPS CLASS; Material: STEEL CORROSION RESISTING. 1 specification is 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.