The Ring Piston, cataloged under National Stock Number 4810-01-478-6467, is classified within Federal Supply Class 4810 (Valves, Powered) of the Valves group. The manufacturer of record is Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4810-01-478-6467 |
| Primary Part Number | 25311-111-0000-000 |
| Item Name | Ring Piston |
| FSC / FSG | 4810 / 48 — Valves, Powered |
| Manufacturer | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| Status | ACTIVE |
| Material | IRON |
| 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 |
|---|---|
| 11608-01 ITEM 13 | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| 25311-111-0000-000 PRIMARY | Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa (USA) |
| Reference | Meaning |
|---|---|
| 11608-01 | D/9 Drawing number reference only Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
NSN 4810-01-478-6467 is a Ring Piston, manufactured by Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa, classified under FSC 4810, Valves, Powered. Status: active.
NSN 4810-01-478-6467 has 2 manufacturer part numbers on file: 11608-01 ITEM 13 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa), 25311-111-0000-000 (Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa).
3 possible matches (shared part number, not a government interchangeability claim): 4810-01-478-6471, 4810-01-478-6476, 5930-01-478-7730. Verify interchangeability with system specifications before substitution.
Key specifications for 25311-111-0000-000: Special Features: ANGLE,VALVE; Material: IRON. 1 specification is 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.