The Valve,safety Relief, cataloged under National Stock Number 4820-01-708-1691, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Aqua Environment Co, Inc. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-708-1691 |
| Primary Part Number | 504-B |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Aqua Environment Co, Inc |
| Status | ACTIVE |
| Nominal Length | 2.5 INCHES ALL ENDS IN |
| Style Designator | SCREW-IN CARTRIDGE |
| Operating Pressure | 6500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Valve Size | 0.25 INCHES IN |
| Material | COPPER ALLOY BODY |
| 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 |
|---|---|
| 504-B PRIMARY | Aqua Environment Co, Inc (USA) |
NSN 4820-01-708-1691 is a Valve,safety Relief, manufactured by Aqua Environment Co, Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-708-1691 has 1 manufacturer part number on file: 504-B (Aqua Environment Co, Inc).
Key specifications for 504-B: Nominal Length: 2.5 INCHES ALL ENDS IN; Style Designator: SCREW-IN CARTRIDGE; Operating Pressure: 6500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Valve Size: 0.25 INCHES IN. 5 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.