The Tube Casing,air Ejector, cataloged under National Stock Number 4320-01-209-0337, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is DC Fabricators Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-209-0337 |
| Primary Part Number | EW-591A |
| Item Name | Tube Casing,air Ejector |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | DC Fabricators Inc |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL,STAINLSS,ASTM-A53 GRADE B; 3.500 IN. OD,3.060 IN. ID; 12.188 IN. L; 2.142 IN. BORE,2.500 TAP,12UNF-3B THREADS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| EW-591A PRIMARY | DC Fabricators Inc (USA) |
| Reference | Meaning |
|---|---|
| 57537 | D/9 Drawing number reference only Siemens Energy, Inc. |
| 57537-52 | 5/9 Secondary reference Siemens Energy, Inc. |
NSN 4320-01-209-0337 is a Tube Casing,air Ejector, manufactured by DC Fabricators Inc, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-209-0337 has 1 manufacturer part number on file: EW-591A (DC Fabricators Inc).
Key specifications for EW-591A: General Characteristics Item Description: STEEL,STAINLSS,ASTM-A53 GRADE B; 3.500 IN. OD,3.060 IN. ID; 12.188 IN. L; 2.142 IN. BORE,2.500 TAP,12UNF-3B THREADS IN; End Item Identification: BALDWIN LIMA HAMILTON CORP AIR EJECTOR PUMP 2580. 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.