The Valve,check, cataloged under National Stock Number 4820-01-593-5435, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Valve,check |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (CAGE 76364); Hunt Valve Company, Inc. (CAGE 11859) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-593-5435 |
| Primary Part Number | 1291-N 3.00IN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| 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 |
|---|---|
| 1291-N 3.00IN PRIMARY | Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA) |
| 1291-N ASSY 1291-N 3.00IN | Hunt Valve Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 1291-N | D/9 Drawing number reference only Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc |
| 1291-N ASSY 1291-N 3.00IN | 5/9 Secondary reference Pima Valve, Llc |
NSN 4820-01-593-5435 is a Valve,check, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-593-5435 has 2 manufacturer part numbers on file: 1291-N 3.00IN (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 1291-N ASSY 1291-N 3.00IN (Hunt Valve Company, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-593-5456, 4820-01-607-8854. 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.