The Pressure Reducer,o,, cataloged under National Stock Number 1660-00-795-0800, 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 Mission Systems Orchard Park Inc. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | Pressure Reducer,o, |
| FSC / FSG | 1660 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment (FSG 16) |
| Manufacturers | Mission Systems Orchard Park Inc (CAGE 04577) |
| Parameter | Value |
|---|---|
| NSN | 1660-00-795-0800 |
| Primary Part Number | F1553-9 |
| Item Name | Pressure Reducer,o, |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Mission Systems Orchard Park Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| F1553-1 | Mission Systems Orchard Park Inc (USA) |
| F1553-9 PRIMARY | Mission Systems Orchard Park Inc (USA) |
| Reference | Meaning |
|---|---|
| F1553-9 | 5/9 Secondary reference Ingersoll-Rand Company Dba Ingersoll-Rand |
| F1553-1 | 5/9 Secondary reference Ingersoll-Rand Company Dba Ingersoll-Rand |
NSN 1660-00-795-0800 is a Pressure Reducer,o,, manufactured by Mission Systems Orchard Park Inc, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-795-0800 has 2 manufacturer part numbers on file: F1553-1 (Mission Systems Orchard Park Inc), F1553-9 (Mission Systems Orchard Park Inc).
1 possible match (shared part number, not a government interchangeability claim): 5915-01-028-1732. 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.
NSN 1660-00-795-0800 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.