The Waterbox, cataloged under National Stock Number 4420-01-185-2440, 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 Ketema Inc Heat Transfer Div. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4420-01-185-2440 |
| Primary Part Number | L-24074 PIECE 1 |
| Item Name | Waterbox |
| FSC / FSG | 4420 / 44 — Heat Exchangers and Steam Condensers |
| Manufacturer | Ketema Inc Heat Transfer Div |
| Status | ACTIVE |
| General Characteristics Item Description | MATL BRONZE; TWO FLANGED ENDS,THE BODY IS 2.21/32 WIDE |
| 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 |
|---|---|
| 01B500F5 | Ketema Inc Heat Transfer Div (USA) |
| L-24074 PIECE 1 PRIMARY | Ketema Inc Heat Transfer Div (USA) |
| Reference | Meaning |
|---|---|
| L-24074 | D/9 Drawing number reference only Ametek Inc Heat Transfer Div |
| L-24074 | D/9 Drawing number reference only Ketema Inc Heat Transfer Div |
| L-24074 PIECE 1 | 5/9 Secondary reference Ametek Inc Heat Transfer Div |
| 323-2-036 | C/1 Advisory reference — outside the item-of-supply concept Ametek Inc Heat Transfer Div |
NSN 4420-01-185-2440 is a Waterbox, manufactured by Ketema Inc Heat Transfer Div, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
NSN 4420-01-185-2440 has 2 manufacturer part numbers on file: 01B500F5 (Ketema Inc Heat Transfer Div), L-24074 PIECE 1 (Ketema Inc Heat Transfer Div).
1 possible match (shared part number, not a government interchangeability claim): 4710-01-186-0663. Verify interchangeability with system specifications before substitution.
Key specifications for L-24074 PIECE 1: General Characteristics Item Description: MATL BRONZE; TWO FLANGED ENDS,THE BODY IS 2.21/32 WIDE. 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.