The Valve,diaphragm,stop, cataloged under National Stock Number 4820-01-342-1259, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Montreal Bronze Ltd Dba Les Fonderies De Bronze Montr?al. Government technical data includes 3 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-342-1259 |
| Primary Part Number | 121-0001 |
| Item Name | Valve,diaphragm,stop |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Montreal Bronze Ltd Dba Les Fonderies De Bronze Montr?al |
| Status | ACTIVE |
| Material Document and Classification | ASTMB61 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Material | BRONZE OVERALL |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 121-0001 PRIMARY | Montreal Bronze Ltd Dba Les Fonderies De Bronze Montr?al (CAN) |
| Reference | Meaning |
|---|---|
| CE21220 | 3/9 Design control — primary reference Itt Fluid Technology Corp Itt Engineered Valves Div |
NSN 4820-01-342-1259 is a Valve,diaphragm,stop, manufactured by Montreal Bronze Ltd Dba Les Fonderies De Bronze Montr?al, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-342-1259 has 1 manufacturer part number on file: 121-0001 (Montreal Bronze Ltd Dba Les Fonderies De Bronze Montr?al).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-396-3206. Verify interchangeability with system specifications before substitution.
Key specifications for 121-0001: Material Document and Classification: ASTMB61 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Material: BRONZE OVERALL; Valve Operation Method: MANUAL. 3 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.