The Valve,safety Relief, cataloged under National Stock Number 4820-01-628-4644, 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 6 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-628-4644 |
| Primary Part Number | LL100XL |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Watts Regulator Company |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 0.750 INCHES FIRST END IN |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Nominal Width | 1.875 INCHES ALL ENDS IN |
| Face to Face Distance | 3.312 INCHES IN |
| 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 |
|---|---|
| LL100XL PRIMARY | Watts Regulator Company (USA) |
| LL100XL-2M7 | Watts Regulator Company (USA) |
| 0556002 | Watts Regulator Company (USA) |
NSN 4820-01-628-4644 is a Valve,safety Relief, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-628-4644 has 3 manufacturer part numbers on file: LL100XL (Watts Regulator Company), LL100XL-2M7 (Watts Regulator Company), 0556002 (Watts Regulator Company).
Key specifications for LL100XL: Nominal Pipe Size Accommodated: 0.750 INCHES FIRST END IN; Connection Type: THREADED EXTERNAL PIPE FIRST END; Style Designator: ANGLE; Nominal Width: 1.875 INCHES ALL ENDS IN. 6 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.