The Pump Piston Assembly, cataloged under National Stock Number 4320-01-084-0528, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Circor Naval Solutions Llc Dba Warren Pumps. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4320-01-084-0528 |
| Primary Part Number | XG-7 |
| Item Name | Pump Piston Assembly |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Circor Naval Solutions Llc Dba Warren Pumps |
| Status | ACTIVE |
| General Characteristics Item Description | CONSISTS OF THE FOLLOWING PARTS: 1 EA PUMP PISTON,GUN METAL CAST,P/N NSS; 1 EA PUMP PISTON FOLLOWER,GUN METAL CAST,P/N VR-21; 3 EA 0.750 IN. COLLAR STUD,CRES,QQ-S-765,CLASS 302,P/N VS-2; 3 EA 0.750 IN. HEX NUT,NAVAL BRASS,QQ-S-657,COMP 1; 3 EA 0.750 IN. HEX JAM NUT,NAVAL BRASS,QQ-S-657,COMP 1; 4 EA PUMP PISTON PACKING RINGS,PLASTIC,P/N UT-24 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 |
|---|---|
| L-2146 | Rps-Fl, Inc. Dba Rps Inc (USA) |
| XG-7 PRIMARY | Circor Naval Solutions Llc Dba Warren Pumps (USA) |
| Reference | Meaning |
|---|---|
| BS5-2349A4 | D/9 Drawing number reference only Circor Naval Solutions Llc Dba Warren Pumps |
| BS5-1711 PCS151 AND 156 THRU 160 | 5/9 Secondary reference Circor Naval Solutions Llc Dba Warren Pumps |
| BS5-1709 PCS151 AND 156 THRU 160 | D/9 Drawing number reference only Circor Naval Solutions Llc Dba Warren Pumps |
NSN 4320-01-084-0528 is a Pump Piston Assembly, manufactured by Circor Naval Solutions Llc Dba Warren Pumps, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-084-0528 has 2 manufacturer part numbers on file: L-2146 (Rps-Fl, Inc. Dba Rps Inc), XG-7 (Circor Naval Solutions Llc Dba Warren Pumps).
3 possible matches (shared part number, not a government interchangeability claim): 4320-01-084-0529, 4320-01-084-3642, 5999-01-105-8550. Verify interchangeability with system specifications before substitution.
Key specifications for XG-7: General Characteristics Item Description: CONSISTS OF THE FOLLOWING PARTS: 1 EA PUMP PISTON,GUN METAL CAST,P/N NSS; 1 EA PUMP PISTON FOLLOWER,GUN METAL CAST,P/N VR-21; 3 EA 0.750 IN. COLLAR STUD,CRES,QQ-S-765,CLASS 302,P/N VS-2; 3 EA 0.750 IN. HEX NUT,NAVAL BRASS,QQ-S-657,COMP 1; 3 EA 0.750 IN. HEX JAM NUT,NAVAL BRASS,QQ-S-657,COMP 1; 4 EA PUMP PISTON PACKING RINGS,PLASTIC,P/N UT-24 IN; End Item Identification: WARREN 6X7X12 VERTICAL SINGLE BILGE PUMP. 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.