The Valve,check, cataloged under National Stock Number 4820-01-181-6433, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tyco Fire Products Lp. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | Tyco Fire Products Lp (CAGE 03670); Wormald Technology (CAGE Z3630) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-181-6433 |
| Primary Part Number | 57922 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tyco Fire Products Lp |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 57922 PRIMARY | Tyco Fire Products Lp (USA) |
| AGF0264 | Wormald Technology (AUS) |
| Reference | Meaning |
|---|---|
| AGF0264 | C/1 Advisory reference — outside the item-of-supply concept Grinnell Corp Grinnell Fire Protection Systmes Div |
| AGF0264 | 5/9 Secondary reference Tyco Fire Products Lp |
NSN 4820-01-181-6433 is a Valve,check, manufactured by Tyco Fire Products Lp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-181-6433 has 2 manufacturer part numbers on file: 57922 (Tyco Fire Products Lp), AGF0264 (Wormald Technology).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-381-6866. 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.