The Valve,safety Relief, cataloged under National Stock Number 4820-01-121-9551, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Todd Combustion Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-121-9551 |
| Primary Part Number | D3-167 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Todd Combustion Inc |
| Status | ACTIVE |
| Material | STEEL CORROSION RESISTING OVERALL |
| 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 |
|---|---|
| D3-167 PRIMARY | Todd Combustion Inc (USA) |
| 47887-4 PIECE 1 THRU 10 | Todd Combustion Inc (USA) |
| Reference | Meaning |
|---|---|
| 5557344 14-21,4 | C/1 Advisory reference — outside the item-of-supply concept Todd Combustion Inc |
| D-42219 PC 1,3- | C/1 Advisory reference — outside the item-of-supply concept Todd Combustion Inc |
NSN 4820-01-121-9551 is a Valve,safety Relief, manufactured by Todd Combustion Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-121-9551 has 2 manufacturer part numbers on file: D3-167 (Todd Combustion Inc), 47887-4 PIECE 1 THRU 10 (Todd Combustion Inc).
Key specifications for D3-167: Material: STEEL CORROSION RESISTING OVERALL. 1 specification is 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.