The Cap,valve, cataloged under National Stock Number 4820-01-157-4373, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Velan Valve Corp.. Government technical data includes 5 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 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 | 4820-01-157-4373 |
| Primary Part Number | 33310PC2-1-2IN |
| Item Name | Cap,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| Valve Model Number for Which Designed | 3-274B AND 3-275B AND 3-284B AND 3-285B |
| Material Document and Classification | ASTM A105, GRADE 2 ASSN STD SINGLE MATERIAL RESPONSE |
| Valve Size for Which Designed | 0.500 INCHES IN |
| Material | STEEL |
| Attachment Method | BOLTS |
| 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 |
|---|---|
| 33310PC2-1-2IN PRIMARY | Velan Valve Corp. (USA) |
| 3BV-1007 PRIMARY | Velan Valve Corp. (USA) |
NSN 4820-01-157-4373 is a Cap,valve, manufactured by Velan Valve Corp., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-157-4373 has 2 manufacturer part numbers on file: 33310PC2-1-2IN (Velan Valve Corp.), 3BV-1007 (Velan Valve Corp.).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-157-4381. Verify interchangeability with system specifications before substitution.
Key specifications for 33310PC2-1-2IN: Valve Model Number for Which Designed: 3-274B AND 3-275B AND 3-284B AND 3-285B; Material Document and Classification: ASTM A105, GRADE 2 ASSN STD SINGLE MATERIAL RESPONSE; Valve Size for Which Designed: 0.500 INCHES IN; Material: STEEL. 5 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.