The Seal Assembly,pump, cataloged under National Stock Number 4320-00-987-3435, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-987-3435 |
| Primary Part Number | 333015 |
| Item Name | Seal Assembly,pump |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer |
| Status | ACTIVE |
| General Characteristics Item Description | 1.125 IN. CAVITY LENGTH,0.844 IN. OPERATING LENGTH,1.638 IN. O/A OD,CONSTS OF 1EACH SHELL,BANK,SPRING,SEAT,GASKET,SEAL FACE AND FRICTION RING 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 |
|---|---|
| 333015 | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer (USA) |
| Reference | Meaning |
|---|---|
| RSD1635 | 3/9 Design control — primary reference Eg and G Sealol Industrial Sealing Div |
| 01-087012 | 5/9 Secondary reference Eg and G Sealol Industrial Sealing Div |
| RS21 | 5/9 Secondary reference Eg and G Sealol Industrial Sealing Div |
NSN 4320-00-987-3435 is a Seal Assembly,pump, manufactured by Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-987-3435 has 1 manufacturer part number on file: 333015 (Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-563-4711. Verify interchangeability with system specifications before substitution.
Key specifications for 333015: General Characteristics Item Description: 1.125 IN. CAVITY LENGTH,0.844 IN. OPERATING LENGTH,1.638 IN. O/A OD,CONSTS OF 1EACH SHELL,BANK,SPRING,SEAT,GASKET,SEAL FACE AND FRICTION RING 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.