The Seat,valve, cataloged under National Stock Number 4820-01-202-9571, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Bs&b Safety Systems Llc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-202-9571 |
| Primary Part Number | 70-99-0004-12 PIECE 77 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Bs&b Safety Systems Llc |
| Status | ACTIVE |
| Material | STEEL CORROSION RESISTING OVERALL |
| 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 |
|---|---|
| 70-99-0004-12 PIECE 77 | Bs&b Safety Systems Llc (USA) |
| Reference | Meaning |
|---|---|
| 70-02-1107-10 | 5/9 Secondary reference Bs&b Safety Systems Llc |
| 70-02-1107-10 | 3/2 Design control — primary reference U.S. Government activity |
| 70-99-0004-12 | D/9 Drawing number reference only Bs&b Safety Systems Llc |
NSN 4820-01-202-9571 is a Seat,valve, manufactured by Bs&b Safety Systems Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-202-9571 has 1 manufacturer part number on file: 70-99-0004-12 PIECE 77 (Bs&b Safety Systems Llc).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-202-9637, 4820-01-202-9703. Verify interchangeability with system specifications before substitution.
Key specifications for 70-99-0004-12 PIECE 77: Material: STEEL CORROSION RESISTING OVERALL. 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.