The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-00-142-3189, 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 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-142-3189 |
| Primary Part Number | 40XL8 85 PSI |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Watts Regulator Company |
| Status | ACTIVE |
| Flow Control Device | POPPET |
| Temp Rating | 210.0 FAHRENHEIT DEGF |
| Second End Relationship with First End | NOT IDENTICAL |
| Body Style | ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS |
| First End Style Designator | PLAIN |
| Bulb Length | 8.000 INCHES NOMINAL IN |
| Bulb Diameter | 0.280 INCHES NOMINAL IN |
| Second End Nominal Pipe Size Accommodated | 0.750 INCHES IN |
| End Connection Quantity | 2 |
| Second End Style Designator | PLAIN |
| Temp Control Device Type | THERMOSTATIC |
| Temp Adjustability | NOT ADJUSTABLE |
| First End Nominal Pipe Size Accommodated | 0.750 INCHES IN |
| Material | COPPER ALLOY BODY |
| Material | COPPER ALLOY FLOW CONTROL DEVICE |
| Material | COPPER ALLOY STEM |
| Material | COPPER ALLOY SEAT |
| Media for Which Designed | WATER, FRESH |
| 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 |
|---|---|
| 40XL8 85 PSI PRIMARY | Watts Regulator Company (USA) |
| Reference | Meaning |
|---|---|
| 40XL8 | 5/9 Secondary reference Watts Regulator Company |
NSN 4820-00-142-3189 is a Valve,relief,pressure and Temper, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-142-3189 has 1 manufacturer part number on file: 40XL8 85 PSI (Watts Regulator Company).
Key specifications for 40XL8 85 PSI: Flow Control Device: POPPET; Temp Rating: 210.0 FAHRENHEIT DEGF; Second End Relationship with First End: NOT IDENTICAL; Body Style: ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS. 18 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.