The Piston,valve Flow, cataloged under National Stock Number 1660-00-421-0427, 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 Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road). 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 1660-00-421-0427 |
| Primary Part Number | 883734-1 |
| Item Name | Piston,valve Flow |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road) |
| Status | ACTIVE |
| General Characteristics Item Description | CRES PER QQ-S-763,COMP 300 SER1ES;2.325 IN. LG BY 1.250 IN. DIA O/A;FIRST END 1.250 IN. LG BY 0.190-32 UNF-3A THD BY 0.1870 IN. MAJOR DIA;SECOND END 0.725 IN. DIA BY 0.605 IN. ID BY 0.162 IN. DEEP;0.300 IN. NECK DIA W/0.135 IN. DIA HOLE THRU A |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 883734-1 PRIMARY | Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road) (USA) |
| Reference | Meaning |
|---|---|
| 883734-1 | 5/9 Secondary reference U.S. Government activity |
NSN 1660-00-421-0427 is a Piston,valve Flow, manufactured by Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road), classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-00-421-0427 has 1 manufacturer part number on file: 883734-1 (Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road)).
1 possible match (shared part number, not a government interchangeability claim): 1315-00-421-9719. Verify interchangeability with system specifications before substitution.
Key specifications for 883734-1: General Characteristics Item Description: CRES PER QQ-S-763,COMP 300 SER1ES;2.325 IN. LG BY 1.250 IN. DIA O/A;FIRST END 1.250 IN. LG BY 0.190-32 UNF-3A THD BY 0.1870 IN. MAJOR DIA;SECOND END 0.725 IN. DIA BY 0.605 IN. ID BY 0.162 IN. DEEP;0.300 IN. NECK DIA W/0.135 IN. DIA HOLE THRU A; End Item Identification: 1660-00-760-4141; VALVE,AIR,ELECTRIC. 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 1660-00-421-0427 has DEMIL Code Q. 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.