The Valve Assembly,cooling, cataloged under National Stock Number 1660-00-809-2644, is classified within Federal Supply Class 1660 (Aircraft Air Conditioning, Heating, and Pressurizing Equipment) of the Aircraft Components and Accessories group. The manufacturer of record is G. S. E. Dynamics, Inc. Dba Gse Dynamics. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1660-00-809-2644 |
| Primary Part Number | 12Y400-811 |
| Item Name | Valve Assembly,cooling |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | G. S. E. Dynamics, Inc. Dba Gse Dynamics |
| Status | ACTIVE |
| General Characteristics Item Description | 1.500 IN. NOM VALVE SIZE;C/O 1 EA CAP,1 EA SPRING,1 EA HOLDER,1 EA CUP,1 EA SEAL,1 EA RETAINER,2 EA WASHER,1 EA NUT,AND 1 EA SCREW IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 12Y400-811 | G. S. E. Dynamics, Inc. Dba Gse Dynamics (USA) |
| Reference | Meaning |
|---|---|
| 12Y400-811 | 3/2 Design control — primary reference U.S. Government activity |
| 12Y400-811 | 5/9 Secondary reference Composite General Inc Aerospace and Defense Div |
NSN 1660-00-809-2644 is a Valve Assembly,cooling, manufactured by G. S. E. Dynamics, Inc. Dba Gse Dynamics, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-809-2644 has 1 manufacturer part number on file: 12Y400-811 (G. S. E. Dynamics, Inc. Dba Gse Dynamics).
Key specifications for 12Y400-811: General Characteristics Item Description: 1.500 IN. NOM VALVE SIZE;C/O 1 EA CAP,1 EA SPRING,1 EA HOLDER,1 EA CUP,1 EA SEAL,1 EA RETAINER,2 EA WASHER,1 EA NUT,AND 1 EA SCREW IN. 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.
NSN 1660-00-809-2644 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.