The Disk,valve, cataloged under National Stock Number 4820-00-358-5619, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Zenith Fuel Systems Llc. Government technical data includes 4 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-358-5619 |
| Primary Part Number | C21-176 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Zenith Fuel Systems Llc |
| Status | ACTIVE |
| Outside Diameter | 1.022 INCHES NOMINAL IN |
| Style Designator | BUTTERFLY |
| Material Document and Classification | SAE 70, 1/2 HARD ASSN STD SINGLE MATERIAL RESPONSE |
| Material | COPPER ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4820-00-358-5619 is a Disk,valve, manufactured by Zenith Fuel Systems Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-358-5619 has 2 manufacturer part numbers on file: C21-176 (Zenith Fuel Systems Llc), 26803 (Mitsubishi Caterpillar Forklift America, Inc).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-670-8408. Verify interchangeability with system specifications before substitution.
Key specifications for C21-176: Outside Diameter: 1.022 INCHES NOMINAL IN; Style Designator: BUTTERFLY; Material Document and Classification: SAE 70, 1/2 HARD ASSN STD SINGLE MATERIAL RESPONSE; Special Features: 2 HOLES 0.165 IN. DIA,0.433 IN. C TO C; TWO 0.250 IN. RADIUS SLOTS ON PERJPHERY IN. 4 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.