The Valve,diaphragm,stop, cataloged under National Stock Number 4820-01-132-0583, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Williams Controls Inc. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Valve,diaphragm,stop |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Oshkosh Defense Llc (CAGE 75Q65); Williams Controls Inc (CAGE 11331); Fasttrax Ltd (CAGE KC7A1); Volvo Group Government Sales Oceani Oceania Volvo Group Government Sales (CAGE Z4117) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-132-0583 |
| Primary Part Number | WM778A |
| Item Name | Valve,diaphragm,stop |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Williams Controls Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| 1321580 | Oshkosh Defense Llc (USA) |
| WM778A PRIMARY | Williams Controls Inc (USA) |
| 1321580 | Fasttrax Ltd (GBR) |
| 6322-118181 | Volvo Group Government Sales Oceani Oceania Volvo Group Government Sales (AUS) |
| Reference | Meaning |
|---|---|
| 118188 | D/9 Drawing number reference only Williams Controls Inc |
| 1321580 | 5/9 Secondary reference Oshkosh Corp |
| 10525653 | 7/2 Vendor item drawing reference General Dynamics Land Systems Canadacorp |
| 378414 | 5/9 Secondary reference U.S. Government activity |
| 4820011320583 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 118181 | 5/9 Secondary reference Williams Controls Inc |
NSN 4820-01-132-0583 is a Valve,diaphragm,stop, manufactured by Williams Controls Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-132-0583 has 4 manufacturer part numbers on file: 1321580 (Oshkosh Defense Llc), WM778A (Williams Controls Inc), 1321580 (Fasttrax Ltd), 6322-118181 (Volvo Group Government Sales Oceani Oceania Volvo Group Government Sales).
3 possible matches (shared part number, not a government interchangeability claim): 6110-01-262-0208, 5999-01-384-2032, 4820-01-421-4639. 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.