The Valve,regulating,temperature, cataloged under National Stock Number 4820-01-087-5901, 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 10 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-087-5901 |
| Primary Part Number | N170L-1-1/4 |
| Item Name | Valve,regulating,temperature |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Watts Regulator Company |
| Status | ACTIVE |
| Flow Control Device | DISK |
| First End Thread Direction | RIGHT-HAND |
| Second End Relationship with First End | IDENTICAL |
| Body Style | TEE ANGLE W/OFFSET |
| First End Style Designator | PLAIN |
| End Connection Quantity | 3 |
| First End Connection Type | THREADED INTERNAL PIPE |
| Temp Adjustability | ADJUSTABLE |
| Material | COPPER ALLOY BODY |
| Thread Size and Series/type Designator | 1-1/4-11-1/2 NPT FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| N170L-1-1/4 PRIMARY | Watts Regulator Company (USA) |
| N170L-M1 | Watts Regulator Company (USA) |
| Reference | Meaning |
|---|---|
| 142C901H01 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-087-5901 is a Valve,regulating,temperature, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-087-5901 has 2 manufacturer part numbers on file: N170L-1-1/4 (Watts Regulator Company), N170L-M1 (Watts Regulator Company).
Key specifications for N170L-1-1/4: Flow Control Device: DISK; First End Thread Direction: RIGHT-HAND; Second End Relationship with First End: IDENTICAL; Body Style: TEE ANGLE W/OFFSET. 10 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.