The Valve,check, cataloged under National Stock Number 4820-01-434-3376, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Robert H Wager Co Inc. Government technical data includes 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-434-3376 |
| Primary Part Number | 4-1750FSG |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Robert H Wager Co Inc |
| Status | ACTIVE |
| Flow Control Device | BALL |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 7.500 INCHES ALL ENDS IN |
| Mounting Position | VERTICAL |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Bolt Hole Nominal Diameter | 0.625 INCHES ALL ENDS IN |
| Valve Size | 4.000 INCHES IN |
| Nominal Outside Diameter | 9.000 INCHES ALL ENDS IN |
| Mounting Facility | BRACKET(S) |
| Bolt Hole Quantity | 8 ALL ENDS |
| Surface Treatment | ZINC |
| Face to Face Distance | 9.625 INCHES IN |
| Media for Which Designed | WATER, FRESH FIRST RESPONSE |
| Media for Which Designed | WATER, SALT SECOND RESPONSE |
| Material | STEEL BODY |
| Material | COPPER FLOW CONTROL DEVICE |
| Valve Operation Method | AUTOMATIC OR MANUAL |
| Nominal Thickness | 0.938 INCHES ALL ENDS IN |
| 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 |
|---|---|
| 4-1750FSG PRIMARY | Robert H Wager Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 1750 | 5/1 Secondary reference Robert H Wager Co Inc |
| 4-1750-F | 5/1 Secondary reference Robert H Wager Co Inc |
NSN 4820-01-434-3376 is a Valve,check, manufactured by Robert H Wager Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-434-3376 has 1 manufacturer part number on file: 4-1750FSG (Robert H Wager Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-552-6360. Verify interchangeability with system specifications before substitution.
Key specifications for 4-1750FSG: Flow Control Device: BALL; Flange Shape: ROUND WITH HOLES ALL ENDS; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 7.500 INCHES ALL ENDS IN. 20 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.