The Head Assembly,pump, cataloged under National Stock Number 4320-01-417-9985, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Pulsafeeder Inc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4320-01-417-9985 |
| Primary Part Number | 28903 |
| Item Name | Head Assembly,pump |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Pulsafeeder Inc |
| Status | ACTIVE |
| General Characteristics Item Description | INCLUDES HEAD, FOUR STAINLESS STEEL |
| Material | PLASTIC |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4320-01-417-9985 is a Head Assembly,pump, manufactured by Pulsafeeder Inc, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-417-9985 has 3 manufacturer part numbers on file: 28903 (Industrial Service and Supply, Inc), J28903 (Pulsafeeder Inc), 28903 (Pulsafeeder Inc).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-546-2480, 5925-01-566-1690. Verify interchangeability with system specifications before substitution.
Key specifications for 28903: General Characteristics Item Description: INCLUDES HEAD, FOUR STAINLESS STEEL; Special Features: HEAD MATERIAL IS ACRYLIC; FOR THE CHEM-TECH SERIES 100 DIAPHRAGM METERING PUMP; End Item Identification: WEAPONS SYSTEM TH, STRATEGIC SEALIFT CONVERSION SHIPS CLASS; Material: PLASTIC. 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.