The Stem,fluid Valve, cataloged under National Stock Number 4820-01-200-9432, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-200-9432 |
| Primary Part Number | 20578-F PIECE 11 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| 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 |
|---|---|
| 20578-F PIECE 11 PRIMARY | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| Reference | Meaning |
|---|---|
| 20578-F | D/9 Drawing number reference only Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
NSN 4820-01-200-9432 is a Stem,fluid Valve, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-200-9432 has 1 manufacturer part number on file: 20578-F PIECE 11 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-200-9482. Verify interchangeability with system specifications before substitution.
Key specifications for 20578-F PIECE 11: Special Features: MATERIAL STAINLESS STEEL, QQ-S-763, CLASS 410, CONDITION A; 30 PSI MAX WORKING PRESSURE; 10 PSI SET PRESSURE; TEMP 610 DEG. FAHR. MAX; FOR 6.000 IN., 150 LBS. RELIEF VALVE LBS. 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.