The Sealing Piston Assembly, cataloged under National Stock Number 4820-01-330-8844, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Interspiro Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-330-8844 |
| Primary Part Number | 336-190-284 |
| Item Name | Sealing Piston Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Interspiro Inc |
| Status | ACTIVE |
| General Characteristics Item Description | P/N 6318040 BALANCING DIAPHRAGM 1;P/N 6318043 GUIDE TIP 1;P/N 6318042 BUSHING 1;P/N 6318041 BUSHING HOUSING 1;P/N 6318039 LIFTING SPINDLE 1 |
| 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 |
|---|---|
| 336-190-284 PRIMARY | Interspiro Inc (USA) |
| 6318038 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 336-190-015 | 5/9 Secondary reference Interspiro Inc |
NSN 4820-01-330-8844 is a Sealing Piston Assembly, manufactured by Interspiro Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-330-8844 has 2 manufacturer part numbers on file: 336-190-284 (Interspiro Inc), 6318038 (Naval Sea Systems Command).
Key specifications for 336-190-284: General Characteristics Item Description: P/N 6318040 BALANCING DIAPHRAGM 1;P/N 6318043 GUIDE TIP 1;P/N 6318042 BUSHING 1;P/N 6318041 BUSHING HOUSING 1;P/N 6318039 LIFTING SPINDLE 1. 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.