The Piston,valve, cataloged under National Stock Number 4820-01-503-9137, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Pti Technologies Inc.. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Piston,valve |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Pti Technologies Inc. (CAGE 05228) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-503-9137 |
| Primary Part Number | 52-10269-2 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Pti Technologies Inc. |
| Status | ACTIVE |
| 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 |
|---|---|
| 52-10269-2 PRIMARY | Pti Technologies Inc. (USA) |
| 11-11447 ITEM 4 | Pti Technologies Inc. (USA) |
| Reference | Meaning |
|---|---|
| 11-11447 | D/9 Drawing number reference only U.S. Government activity |
| 52-10269-2 | 5/9 Secondary reference U.S. Government activity |
| 11-11447 ITEM 4 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-503-9137 is a Piston,valve, manufactured by Pti Technologies Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-503-9137 has 2 manufacturer part numbers on file: 52-10269-2 (Pti Technologies Inc.), 11-11447 ITEM 4 (Pti Technologies Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4330-01-503-9493. Verify interchangeability with system specifications before substitution.
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.