The Seat,valve, cataloged under National Stock Number 4820-01-202-3121, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics. Government technical data includes 5 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-202-3121 |
| Primary Part Number | 2721433 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics |
| Status | ACTIVE |
| Body Stepped Inside Diameter | 0.4345 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 0.437 INCHES NOMINAL THIRD STEP IN |
| Body Stepped Inside Diameter | 0.465 INCHES NOMINAL SECOND STEP IN |
| Material Document and Classification | QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Material | STEEL COMP 303 OVERALL |
| 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 |
|---|---|
| 2721433 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics (USA) |
| Reference | Meaning |
|---|---|
| 2721433 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4820-01-202-3121 is a Seat,valve, manufactured by Parker-Hannifin Corporation Dba Pneutronics, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-202-3121 has 1 manufacturer part number on file: 2721433 (Parker-Hannifin Corporation Dba Pneutronics).
Key specifications for 2721433: Overall Height: 0.870 INCHES NOMINAL IN; Body Stepped Inside Diameter: 0.4345 INCHES NOMINAL FIRST STEP IN; Body Stepped Inside Diameter: 0.437 INCHES NOMINAL THIRD STEP IN; Body Stepped Inside Diameter: 0.465 INCHES NOMINAL SECOND STEP IN. 5 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.