The Cover Assembly,weldment, cataloged under National Stock Number 4220-01-040-3864, is classified within Federal Supply Class 4220 (Marine Lifesaving and Diving Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Biomarine Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4220-01-040-3864 |
| Primary Part Number | 300-431 |
| Item Name | Cover Assembly,weldment |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Manufacturer | Biomarine Inc |
| Status | ACTIVE |
| General Characteristics Item Description | CONSISTS OF P/N 400 203 P2 SCRUBBER 1; P/N 200-750 HOUSING,CENTER SEAL 1; KYNAR COATED EXCEPT THREADS AND THRUBORE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4220-01-040-3864 is a Cover Assembly,weldment, manufactured by Biomarine Inc, classified under FSC 4220, Marine Lifesaving and Diving Equipment. Status: active.
NSN 4220-01-040-3864 has 3 manufacturer part numbers on file: 300-431 (Biomarine Inc), 400-174-2 (Biomarine Inc), 300-431G1 (Biomarine Inc).
2 possible matches (shared part number, not a government interchangeability claim): 3120-01-393-6256, 5340-01-698-6546. Verify interchangeability with system specifications before substitution.
Key specifications for 300-431: General Characteristics Item Description: CONSISTS OF P/N 400 203 P2 SCRUBBER 1; P/N 200-750 HOUSING,CENTER SEAL 1; KYNAR COATED EXCEPT THREADS AND THRUBORE. 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.