The Piston and Diaphragm Assembly, cataloged under National Stock Number 4820-01-277-9111, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Piston and Diaphragm Assembly |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-277-9111 |
| Item Name | Piston and Diaphragm Assembly |
| 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) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 8009-1 | 3/2 Design control — primary reference U.S. Government activity |
| 8009-1 | 3/9 Design control — primary reference Air Dry Co of America, Llc |
| 6532-30-4 ITEM 9 | 5/2 Secondary reference U.S. Government activity |
| 6532-30-4 | D/9 Drawing number reference only Air Dry Co of America, Llc |
| 6532-30-4 ITEM 9 | 5/9 Secondary reference Air Dry Co of America, Llc |
NSN 4820-01-277-9111 is a Piston and Diaphragm Assembly, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 6220-01-390-8620, 6640-01-727-5043. 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.