The Valve,vent, cataloged under National Stock Number 4820-01-310-7704, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Haywardindl. Products, Inc.. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-310-7704 |
| Primary Part Number | VC-SS-SP-4IN |
| Item Name | Valve,vent |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Haywardindl. Products, Inc. |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES FIRST END |
| Flange Face Design | RAISED STRAIGHT FIRST END |
| Bolt Circle Nominal Diameter | 7.500 INCHES FIRST END IN |
| Connection Type | FLANGE FIRST END |
| Bolt Hole Nominal Diameter | 0.750 INCHES FIRST END IN |
| Nominal Outside Diameter | 9.000 INCHES FIRST END IN |
| Bolt Hole Quantity | 8 FIRST END |
| Material | STEEL CORROSION RESISTING BODY |
| Raised Face Nominal Diameter | 6.188 INCHES FIRST END IN |
| Raised Face Nominal Height | 0.063 INCHES FIRST END 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 |
|---|---|
| VVC-500-4IN FLANGED | Haywardindl. Products, Inc. (USA) |
| VC-SS-SP-4IN PRIMARY | Haywardindl. Products, Inc. (USA) |
| Reference | Meaning |
|---|---|
| VVC-500-4IN FLG | C/1 Advisory reference — outside the item-of-supply concept Haywardindl. Products, Inc. |
| VC-SS-SP | D/9 Drawing number reference only Haywardindl. Products, Inc. |
NSN 4820-01-310-7704 is a Valve,vent, manufactured by Haywardindl. Products, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-310-7704 has 2 manufacturer part numbers on file: VVC-500-4IN FLANGED (Haywardindl. Products, Inc.), VC-SS-SP-4IN (Haywardindl. Products, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-313-7631. Verify interchangeability with system specifications before substitution.
Key specifications for VC-SS-SP-4IN: Flange Shape: ROUND WITH HOLES FIRST END; Flange Face Design: RAISED STRAIGHT FIRST END; Bolt Circle Nominal Diameter: 7.500 INCHES FIRST END IN; Connection Type: FLANGE FIRST END. 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.