The Seat,valve, cataloged under National Stock Number 4820-00-388-1948, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Cooper Machinery Services Llc. Government technical data includes 6 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-388-1948 |
| Primary Part Number | GSB-11-S#1 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Cooper Machinery Services Llc |
| Status | ACTIVE |
| Body Outside Diameter | 3.882 INCHES MINIMUM AND 3.883 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 3.125 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Seat Angle in Deg | 35.000 MINIMUM AND 55.000 MAXIMUM |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| GSB-11-S#1 PRIMARY | Cooper Machinery Services Llc (USA) |
| Reference | Meaning |
|---|---|
| GSBA11CPC80 | 5/9 Secondary reference Cooper Machinery Services Llc |
| GSB11SNUMBER1 | 5/9 Secondary reference Cooper Machinery Services Llc |
| GSBF11PC80 | 5/9 Secondary reference Cooper Machinery Services Llc |
NSN 4820-00-388-1948 is a Seat,valve, manufactured by Cooper Machinery Services Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-388-1948 has 1 manufacturer part number on file: GSB-11-S#1 (Cooper Machinery Services Llc).
Key specifications for GSB-11-S#1: Overall Height: 0.625 INCHES NOMINAL IN; Body Outside Diameter: 3.882 INCHES MINIMUM AND 3.883 INCHES MAXIMUM IN; Style Designator: PLAIN; Body Inside Diameter: 3.125 INCHES NOMINAL IN. 6 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.