The Muffler,dehydrator, cataloged under National Stock Number 4440-00-778-6313, is classified within Federal Supply Class 4440 (Driers, Dehydrators, and Anhydrators) of the Furnace, Steam, Drying, Nuclear Reactors group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4440-00-778-6313 |
| Item Name | Muffler,dehydrator |
| FSC / FSG | 4440 / 44 — Driers, Dehydrators, and Anhydrators |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM ALLOY ATERIAL;3.236 IN. LG 1.244 IN. OD,ONE END THD INT 0.375-18 NPT 0.808 THD LG;OTHER END CLOSED;W/EIGHT HALF MOON NOTCHES EQUALLY SPACED ON OUTER SURFACE OF BODY IN |
| 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 |
|---|---|
| 2057-63 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4440-00-778-6313 is a Muffler,dehydrator, classified under FSC 4440, Driers, Dehydrators, and Anhydrators. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 1660-00-887-6877, 5331-01-626-4346. Verify interchangeability with system specifications before substitution.
Key specifications for 4440-00-778-6313: General Characteristics Item Description: ALUMINUM ALLOY ATERIAL;3.236 IN. LG 1.244 IN. OD,ONE END THD INT 0.375-18 NPT 0.808 THD LG;OTHER END CLOSED;W/EIGHT HALF MOON NOTCHES EQUALLY SPACED ON OUTER SURFACE OF BODY IN. 1 specification is 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.