The Connector-Reducer,valve Assy, cataloged under National Stock Number 1660-01-210-0004, 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 Rtx Corporation Div Pratt & Whitney. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1660-01-210-0004 |
| Primary Part Number | 736521 |
| Item Name | Connector-Reducer,valve Assy |
| FSC / FSG | 1660 / 16 — Aircraft Air Conditioning, Heating, and Pressurizing Equipment |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| FSC Application Data | VALVE,FLOW CONTROL P/N735342 |
| General Characteristics Item Description | STEEL COMP 303; OUTSIDE DIA. 0.990 IN. MIN. TO 1.010 IN. MAX.; 0.960 IN. MIN. TO 0.970 IN. MAX. IN |
| 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 |
|---|---|
| 736521 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| 736521 | 5/9 Secondary reference U.S. Government activity |
NSN 1660-01-210-0004 is a Connector-Reducer,valve Assy, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 1660, Aircraft Air Conditioning, Heating, and Pressurizing Equipment. Status: active.
NSN 1660-01-210-0004 has 1 manufacturer part number on file: 736521 (Rtx Corporation Div Pratt & Whitney).
Key specifications for 736521: FSC Application Data: VALVE,FLOW CONTROL P/N735342; General Characteristics Item Description: STEEL COMP 303; OUTSIDE DIA. 0.990 IN. MIN. TO 1.010 IN. MAX.; 0.960 IN. MIN. TO 0.970 IN. MAX. IN; End Item Identification: B-1B ACFT. 2 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.