The Damper,valve,check, cataloged under National Stock Number 4820-01-057-8997, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Eaton Aerospace Llc. Government technical data includes 2 specifications, 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-057-8997 |
| Primary Part Number | 90P508-R |
| Item Name | Damper,valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Eaton Aerospace Llc |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 90P508-R | Eaton Aerospace Llc (USA) |
| 90P508CP | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 90P508-R | 5/9 Secondary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
| 190000 PIECE 9CP | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
| VV91-C8V-08PIECE9 | 5/9 Secondary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
| 90P508 | 3/1 Design control — primary reference Eaton Aerospace Llc |
| 90P508-CP | 5/9 Secondary reference Cold Llc |
| 90P508CP | 5/9 Secondary reference Eaton Aerospace Llc |
| 190000 PIECE 9 | 5/9 Secondary reference Eaton Corporation Dba Eaton Inoac Div Eaton |
| 90P508-RCP | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-057-8997 is a Damper,valve,check, manufactured by Eaton Aerospace Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-057-8997 has 2 manufacturer part numbers on file: 90P508-R (Eaton Aerospace Llc), 90P508CP (Naval Inventory Control Point Mechanicsburg).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-124-0307, 4820-01-144-9230. Verify interchangeability with system specifications before substitution.
Key specifications for 90P508-R: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: CLEANING, PACKAGING, AND MARKING IAW MIL-STD-1330D. 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.