The Valve,safety Relief, cataloged under National Stock Number 4820-01-423-8669, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Watts Regulator Company. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4820-01-423-8669 |
| Primary Part Number | 0158675 |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Watts Regulator Company |
| Status | ACTIVE |
| Operating Pressure | 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 210.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Media for Which Designed | WATER, FRESH SINGLE RESPONSE |
| 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 |
|---|---|
| 40XL-83/4 | Watts Regulator Company (USA) |
| 94-7342-T PC NO.10 | The Electric Heater Co Dba Hubbell Electric Heater Co. (USA) |
| 0158675 PRIMARY | Watts Regulator Company (USA) |
| Reference | Meaning |
|---|---|
| 40XL-8-3/4" | C/1 Advisory reference — outside the item-of-supply concept Watts Regulator Company |
| 94-7342-T | D/9 Drawing number reference only The Electric Heater Co Dba Hubbell Electric Heater Co. |
NSN 4820-01-423-8669 is a Valve,safety Relief, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-423-8669 has 3 manufacturer part numbers on file: 40XL-83/4 (Watts Regulator Company), 94-7342-T PC NO.10 (The Electric Heater Co Dba Hubbell Electric Heater Co.), 0158675 (Watts Regulator Company).
1 possible match (shared part number, not a government interchangeability claim): 4520-01-423-8702. Verify interchangeability with system specifications before substitution.
Key specifications for 0158675: Operating Pressure: 100.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Maximum Operating Temp: 210.0 FAHRENHEIT SINGLE RESPONSE DEGF; Media for Which Designed: WATER, FRESH SINGLE RESPONSE; End Item Identification: STRATEGIC SEALIFT CONVERSION SHIPS CLASS. 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.