The Retainer,seat,valve, cataloged under National Stock Number 4820-01-420-2899, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-420-2899 |
| Item Name | Retainer,seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material Document and Classification | QQ-S-763, CLASS 316 SS FED SPEC SINGLE MATERIAL RESPONSE |
| Valve Design Control Activity | 99565 |
| Material | STEEL COMP 316 |
| 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 |
|---|---|
| PLC-11668 | D/9 Drawing number reference only U.S. Government activity |
| 107950CACP | C/1 Advisory reference — outside the item-of-supply concept Naval Inventory Control Point Mechanicsburg |
| PLC-11706 | D/9 Drawing number reference only U.S. Government activity |
| 107950CA NITROGEN CLEAN | 3/2 Design control — primary reference U.S. Government activity |
| PLC-11706 ITEM 4 NITROGEN CLEAN | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-420-2899 is a Retainer,seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-420-3077, 4820-01-420-5246, 4820-01-420-8658. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-420-2899: Material Document and Classification: QQ-S-763, CLASS 316 SS FED SPEC SINGLE MATERIAL RESPONSE; Special Features: NITROGEN CLEANED I/A/W MIL-STD-1330C (SHIPS); Valve Design Control Activity: 99565; End Item Identification: NIMITZ CLASS CVN. 3 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.