The Seat,valve, cataloged under National Stock Number 4820-01-137-7176, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Walworth Company. Government technical data includes 2 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-137-7176 |
| Primary Part Number | 2620-902X10 PIECE 20 1-2IN |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Walworth Company |
| Status | ACTIVE |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Material | COPPER ALLOY OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2620-902X10 PIECE 20 1-2IN PRIMARY | The Walworth Company (USA) |
| Reference | Meaning |
|---|---|
| 2110254 | D/9 Drawing number reference only U.S. Government activity |
| 2620-902X10 PIECE 20 1-2IN | 5/9 Secondary reference U.S. Government activity |
| 845-2110254 PIECE 20 1-2IN | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-137-7176 is a Seat,valve, manufactured by The Walworth Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-137-7176 has 1 manufacturer part number on file: 2620-902X10 PIECE 20 1-2IN (The Walworth Company).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-529-0703. Verify interchangeability with system specifications before substitution.
Key specifications for 2620-902X10 PIECE 20 1-2IN: Material Document and Classification: QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Material: COPPER ALLOY OVERALL. 2 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.
NSN 4820-01-137-7176 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.