The Seat,valve, cataloged under National Stock Number 4820-01-438-5303, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-438-5303 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material Document and Classification | SAE 660 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material | COPPER ALLOY SEAT |
| 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 |
|---|---|
| VV-0300-11105577 | D/9 Drawing number reference only Kings Point Machinery Inc Dba Kpm |
| VV-0300-11105577 PC 8 | 3/9 Design control — primary reference Kings Point Machinery Inc Dba Kpm |
NSN 4820-01-438-5303 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-438-5355, 4820-01-438-5384, 4820-01-439-7291. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-438-5303: Material Document and Classification: SAE 660 ASSN STD SINGLE MATERIAL RESPONSE SEAT; End Item Identification: 3IN INVERTED VENT CHECK VALVE IN; Material: COPPER ALLOY SEAT. 2 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.