The Diaphragm,valve,flat, cataloged under National Stock Number 4810-00-904-8991, is classified within Federal Supply Class 4810 (Valves, Powered) of the Valves group. The manufacturer of record is Automatic Switch Company Dba Asco. Government technical data includes 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4810-00-904-8991 |
| Primary Part Number | 088636-025 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4810 / 48 — Valves, Powered |
| Manufacturer | Automatic Switch Company Dba Asco |
| Status | ACTIVE |
| Outside Diameter | 3.285 INCHES NOMINAL IN |
| Style Designator | FLAT |
| Material Thickness | 0.035 INCHES NOMINAL IN |
| Bolt Hole Quantity | 4 |
| Bolt Circle Diameter | 3.450 INCHES NOMINAL IN |
| Outside Corner Radius | 0.406 INCHES NOMINAL IN |
| Material | RUBBER FABRIC REINFORCED |
| Hole Diameter | 0.340 INCHES NOMINAL IN |
| 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 |
|---|---|
| 088636-025 PRIMARY | Automatic Switch Company Dba Asco (USA) |
| Reference | Meaning |
|---|---|
| FV886-36-25 | C/1 Advisory reference — outside the item-of-supply concept Automatic Switch Company Dba Asco |
| 88636-1 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
| FV88-636-1 | 5/9 Secondary reference Automatic Switch Company Dba Asco |
NSN 4810-00-904-8991 is a Diaphragm,valve,flat, manufactured by Automatic Switch Company Dba Asco, classified under FSC 4810, Valves, Powered. Status: active.
NSN 4810-00-904-8991 has 1 manufacturer part number on file: 088636-025 (Automatic Switch Company Dba Asco).
2 possible matches (shared part number, not a government interchangeability claim): 5365-01-105-7133, 6150-01-156-9044. Verify interchangeability with system specifications before substitution.
Key specifications for 088636-025: Outside Diameter: 3.285 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.035 INCHES NOMINAL IN; Bolt Hole Quantity: 4. 8 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.