The Seat,valve, cataloged under National Stock Number 4820-00-014-6791, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa. Government technical data includes 6 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-014-6791 |
| Primary Part Number | 20401HPC43 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| Status | ACTIVE |
| Body Outside Diameter | 13.750 INCHES NOMINAL IN |
| Style Designator | PLAIN |
| Material Document and Classification | MIL-R-6855 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 10.500 INCHES NOMINAL IN |
| Material | RUBBER SYNTHETIC OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 20401HPC43 PRIMARY | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
NSN 4820-00-014-6791 is a Seat,valve, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-014-6791 has 1 manufacturer part number on file: 20401HPC43 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).
Key specifications for 20401HPC43: Overall Height: 0.625 INCHES NOMINAL IN; Body Outside Diameter: 13.750 INCHES NOMINAL IN; Style Designator: PLAIN; Material Document and Classification: MIL-R-6855 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 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.