The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-00-115-3989, 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. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-115-3989 |
| Primary Part Number | 25646-237 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| Status | ACTIVE |
| Material | RUBBER SYNTHETIC |
| 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 |
|---|---|
| 20210-D PC12 | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| 25646-237 PRIMARY | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| Reference | Meaning |
|---|---|
| 10440-12 | 5/9 Secondary reference Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| 25647-237 | 5/9 Secondary reference Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| 20210PC12 | 5/9 Secondary reference Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
NSN 4820-00-115-3989 is a Diaphragm,actuator Valve,special, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-115-3989 has 2 manufacturer part numbers on file: 20210-D PC12 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa), 25646-237 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).
Key specifications for 25646-237: Material: RUBBER SYNTHETIC. 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.