The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-01-126-9941, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator. Government technical data includes 6 specifications, 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. 2 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 | 4820-01-126-9941 |
| Primary Part Number | 78904 |
| Item Name | Diaphragm,actuator Valve,special |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator |
| Status | ACTIVE |
| Bead Diameter | 0.690 INCHES NOMINAL IN |
| Outside Diameter | 1.375 INCHES NOMINAL IN |
| Style Designator | SPECIAL SHAPED |
| Material Thickness | 0.013 INCHES MINIMUM AND 0.017 INCHES MAXIMUM IN |
| Center Hole Diameter | 0.185 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN |
| Material | RUBBER |
| 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 |
|---|---|
| 78904 PRIMARY | Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator (USA) |
| 78875 PART 78904 | Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator (USA) |
NSN 4820-01-126-9941 is a Diaphragm,actuator Valve,special, manufactured by Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-126-9941 has 2 manufacturer part numbers on file: 78904 (Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator), 78875 PART 78904 (Eaton Aerospace Llc Dba Sterer Engineering Div Valve & Actuator).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-213-9873, 4730-01-662-6000. Verify interchangeability with system specifications before substitution.
Key specifications for 78904: Bead Diameter: 0.690 INCHES NOMINAL IN; Outside Diameter: 1.375 INCHES NOMINAL IN; Style Designator: SPECIAL SHAPED; Material Thickness: 0.013 INCHES MINIMUM AND 0.017 INCHES MAXIMUM IN. 6 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.