The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-035-9673, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Acme Products & Engineering Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Acme Products & Engineering Inc (CAGE 1T943) |
| Parameter | Value |
|---|---|
| NSN | 4820-00-035-9673 |
| Primary Part Number | P425A-AP |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Acme Products & Engineering Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| P425A-AP PRIMARY | Acme Products & Engineering Inc (USA) |
| Reference | Meaning |
|---|---|
| NAP34PC8 | 5/9 Secondary reference Atlas Valve Co |
| P425A | 5/9 Secondary reference Atlas Valve Co |
| 399337PC8 | 5/2 Secondary reference U.S. Government activity |
| NAP544PC11 | 5/9 Secondary reference Atlas Valve Co |
| P425A-00 | 3/9 Design control — primary reference Atlas Valve Co |
NSN 4820-00-035-9673 is a Diaphragm,valve,flat, manufactured by Acme Products & Engineering Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-035-9673 has 1 manufacturer part number on file: P425A-AP (Acme Products & Engineering Inc).
1 possible match (shared part number, not a government interchangeability claim): 3040-00-040-2433. Verify interchangeability with system specifications before substitution.
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.