The Mullion Heater,freezer, cataloged under National Stock Number 4520-01-509-7203, 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 Cospolich Inc.. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-509-7203 |
| Primary Part Number | L1HR183 |
| Item Name | Mullion Heater,freezer |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Cospolich Inc. |
| Status | ACTIVE |
| Voltage in Volts and Current Type | 115.0 AC |
| Material | GLASS FIBER |
| 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 |
|---|---|
| L1HR183 | Refrigeration Hardware Supply Corporation Dba Refrigeration Hardware Supply Corp (USA) |
| L1HR183 PRIMARY | Cospolich Inc. (USA) |
| 50692 REV C ITEM NO 32 | Cospolich Inc. (USA) |
| Reference | Meaning |
|---|---|
| L1HR127 | 5/9 Secondary reference Refrigeration Hardware Supply Corporation Dba Refrigeration Hardware Supply Corp |
| 50693 REV B ITEM NO 32 | 5/9 Secondary reference Cospolich Inc. |
NSN 4520-01-509-7203 is a Mullion Heater,freezer, manufactured by Cospolich Inc., classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-509-7203 has 3 manufacturer part numbers on file: L1HR183 (Refrigeration Hardware Supply Corporation Dba Refrigeration Hardware Supply Corp), L1HR183 (Cospolich Inc.), 50692 REV C ITEM NO 32 (Cospolich Inc.).
Key specifications for L1HR183: Voltage in Volts and Current Type: 115.0 AC; Overall Length: 183.000 INCHES NOMINAL IN; Special Features: A FIBERGLASS WRAPPED DOOR HEATER, USED TO PROVIDE A THERMAL BREAK BETWEEN THE INTERIOR OF THE CABINET AND THE EXTERIOR OF THE CABINET; End Item Identification: FREEZER. 2 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.