The Piston,valve, cataloged under National Stock Number 4820-01-406-8784, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Metrex Valve Corp. Dba Metrex Valve Corp. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-406-8784 |
| Primary Part Number | 45M-421 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Metrex Valve Corp. Dba Metrex Valve Corp |
| Status | ACTIVE |
| Valve Type for Which Designed | CHECK |
| Valve Model Number for Which Designed | M700P-5075 |
| Valve Size for Which Designed | 0.500 INCHES IN |
| Valve Design Control Activity | 21013 |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| 45M-421 PRIMARY | Metrex Valve Corp. Dba Metrex Valve Corp (USA) |
| Reference | Meaning |
|---|---|
| M700P-5075-FL-3W | D/9 Drawing number reference only Metrex Valve Corp. Dba Metrex Valve Corp |
| M700P-5075-FL-3W-19 | 5/9 Secondary reference Metrex Valve Corp. Dba Metrex Valve Corp |
NSN 4820-01-406-8784 is a Piston,valve, manufactured by Metrex Valve Corp. Dba Metrex Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-406-8784 has 1 manufacturer part number on file: 45M-421 (Metrex Valve Corp. Dba Metrex Valve Corp).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-406-8787, 4820-01-407-0778, 4820-01-407-0782. Verify interchangeability with system specifications before substitution.
Key specifications for 45M-421: Valve Type for Which Designed: CHECK; Valve Model Number for Which Designed: M700P-5075; Valve Size for Which Designed: 0.500 INCHES IN; Valve Design Control Activity: 21013. 5 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.