The Ring,back Up,valve, cataloged under National Stock Number 4820-00-963-8658, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Ring,back Up,valve |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Parameter | Value |
|---|---|
| NSN | 4820-00-963-8658 |
| Item Name | Ring,back Up,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Reference | Meaning |
|---|---|
| 1-1157-54 | 3/9 Design control — primary reference Rockwell Mfg Co Republic Div |
NSN 4820-00-963-8658 is a Ring,back Up,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5330-01-067-0377. Verify interchangeability with system specifications before substitution.
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.