The Valve,vacuum Breaking, cataloged under National Stock Number 4820-01-465-5485, 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 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-465-5485 |
| Primary Part Number | 1 1/4 IN 800M4QT |
| Item Name | Valve,vacuum Breaking |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Watts Regulator Company |
| Status | ACTIVE |
| Flow Control Device | DISK, FLAT |
| Temp Rating | 140.0 FAHRENHEIT DEGF |
| Body Style | ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS |
| End Connection Quantity | 2 |
| Material | COPPER ALLOY BODY |
| Material | RUBBER SYNTHETIC FLOW CONTROL DEVICE |
| 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 |
|---|---|
| 1 1/4 IN 800M4QT PRIMARY | Watts Regulator Company (USA) |
| Reference | Meaning |
|---|---|
| 800M4QT | C/1 Advisory reference — outside the item-of-supply concept Watts Regulator Company |
NSN 4820-01-465-5485 is a Valve,vacuum Breaking, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-465-5485 has 1 manufacturer part number on file: 1 1/4 IN 800M4QT (Watts Regulator Company).
Key specifications for 1 1/4 IN 800M4QT: Flow Control Device: DISK, FLAT; Temp Rating: 140.0 FAHRENHEIT DEGF; Body Style: ANGLE GIVE "ADQM" AND "ADQN" ONLY IF FLANGED ONE OR TWO ENDS; End Connection Quantity: 2. 7 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.