The Tailpiece,valve, cataloged under National Stock Number 4820-01-199-7738, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-199-7738 |
| Item Name | Tailpiece,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Design Type | ANGLE |
| Valve Model Number for Which Designed | 2640-048 ASSY C |
| Connection Type | FLANGE, ROUND W/HOLES |
| Valve Size for Which Designed | 3.500 INCHES IN |
| Flange Diameter | 8.125 INCHES IN |
| Material | NICKEL ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 2640-048 | D/9 Drawing number reference only U.S. Government activity |
| 2640-048 ASSEMB | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 2640-048 ASSEMBLY C PIECE 4 | 3/2 Design control — primary reference U.S. Government activity |
| 845-1889797ASSY C PIECE 4 | 3/2 Design control — primary reference U.S. Government activity |
| 845-1889797 | D/9 Drawing number reference only U.S. Government activity |
| 2640-048PC4 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4820-01-199-7738 is a Tailpiece,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-199-7739. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-199-7738: Design Type: ANGLE; Valve Model Number for Which Designed: 2640-048 ASSY C; Connection Type: FLANGE, ROUND W/HOLES; Valve Size for Which Designed: 3.500 INCHES IN. 6 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.