The Heater,fluid,industrial, cataloged under National Stock Number 4420-01-425-3710, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. The manufacturer of record is Leslie Controls, Inc. Dba Leslie Controls Inc. Government technical data includes 14 specifications, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4420-01-425-3710 |
| Primary Part Number | E300-90/4.4.1 ALT.5 |
| Item Name | Heater,fluid,industrial |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Leslie Controls, Inc. Dba Leslie Controls Inc |
| Status | ACTIVE |
| Heat Transfer Method | INDIRECT |
| Connection Type | THREADED EXTERNAL PIPE HEATED FLUID OUTLET |
| Connection Type | THREADED EXTERNAL PIPE HEATING FLUID INLET |
| Connection Type | THREADED INTERNAL PIPE CONDENSATE RETURN |
| Connection Type | THREADED INTERNAL PIPE STEAM INLET |
| Features Provided | TEMPERATURE REGULATING VALVE |
| Connection Nominal Diameter | 1.250 INCHES CONDENSATE RETURN IN |
| Connection Nominal Diameter | 1.500 INCHES HEATING FLUID INLET IN |
| Connection Nominal Diameter | 2.000 INCHES HEATED FLUID OUTLET IN |
| Connection Nominal Diameter | 3.000 INCHES STEAM INLET IN |
| Capacity Rating | 1800.0 GALLONS PER HOUR |
| Maximum Steam Working Pressure | ERR-060 |
| Material | COPPER TUBES |
| Material | IRON SHELL |
| 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 |
|---|---|
| E300-90/4.4.1 ALT.5 PRIMARY | Leslie Controls, Inc. Dba Leslie Controls Inc (USA) |
| Reference | Meaning |
|---|---|
| 90/4.4.1 ALT.5 | 5/1 Secondary reference Leslie Controls, Inc. Dba Leslie Controls Inc |
| E300-90/4.4.1AL | C/1 Advisory reference — outside the item-of-supply concept Leslie Controls, Inc. Dba Leslie Controls Inc |
NSN 4420-01-425-3710 is a Heater,fluid,industrial, manufactured by Leslie Controls, Inc. Dba Leslie Controls Inc, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-425-3710 has 1 manufacturer part number on file: E300-90/4.4.1 ALT.5 (Leslie Controls, Inc. Dba Leslie Controls Inc).
1 possible match (shared part number, not a government interchangeability claim): 4420-01-437-0869. Verify interchangeability with system specifications before substitution.
Key specifications for E300-90/4.4.1 ALT.5: Heat Transfer Method: INDIRECT; Connection Type: THREADED EXTERNAL PIPE HEATED FLUID OUTLET; Connection Type: THREADED EXTERNAL PIPE HEATING FLUID INLET; Connection Type: THREADED INTERNAL PIPE CONDENSATE RETURN. 14 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.