The Valve,safety Relief, cataloged under National Stock Number 4820-01-554-5489, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Howell Laboratories Inc Dba Howell Laboratories Inc. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-554-5489 |
| Primary Part Number | 4875 ITEM 7 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Howell Laboratories Inc Dba Howell Laboratories Inc |
| Status | ACTIVE |
| Adjustable Pressure Range | +73.0 TO 150.0 POUNDS PER SQUARE INCH LBS |
| Material | STEEL COMP 316 BODY |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 4875 ITEM 7 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 4870 ITEM 27 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 4875C-G507 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| Reference | Meaning |
|---|---|
| D559T1-3M-100 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-554-5489 is a Valve,safety Relief, manufactured by Howell Laboratories Inc Dba Howell Laboratories Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-554-5489 has 3 manufacturer part numbers on file: 4875 ITEM 7 (Howell Laboratories Inc Dba Howell Laboratories Inc), 4870 ITEM 27 (Howell Laboratories Inc Dba Howell Laboratories Inc), 4875C-G507 (Howell Laboratories Inc Dba Howell Laboratories Inc).
Key specifications for 4875 ITEM 7: Adjustable Pressure Range: +73.0 TO 150.0 POUNDS PER SQUARE INCH LBS; End Item Identification: CONTROL PANEL, LOW-PRESSURE AIR; Material: STEEL COMP 316 BODY; Valve Operation Method: AUTOMATIC. 3 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.