The Auto-Drain, cataloged under National Stock Number 4820-01-458-0400, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-458-0400 |
| Primary Part Number | WL024 |
| Item Name | Auto-Drain |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc |
| 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 |
|---|---|
| BB100NNS26 ITEM 4 | Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc (USA) |
| WL024 PRIMARY | Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc (USA) |
| Reference | Meaning |
|---|---|
| BB100NNS26 | D/9 Drawing number reference only Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc |
NSN 4820-01-458-0400 is a Auto-Drain, manufactured by Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-458-0400 has 2 manufacturer part numbers on file: BB100NNS26 ITEM 4 (Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc), WL024 (Air Systems International, Inc. (used in VA by: Air Systems, Inc.) Dba Air Systems International Inc).
2 possible matches (shared part number, not a government interchangeability claim): 4940-01-463-8561, 4330-01-464-2056. Verify interchangeability with system specifications before substitution.
Key specifications for WL024: End Item Identification: LOS ANGELES CLASS SSN (688). 0 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.