The Y-Coupler, cataloged under National Stock Number 4220-01-561-3564, is classified within Federal Supply Class 4220 (Marine Lifesaving and Diving Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Circor Aerospace 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4220-01-561-3564 |
| Primary Part Number | SE50341 |
| Item Name | Y-Coupler |
| FSC / FSG | 4220 / 42 — Marine Lifesaving and Diving Equipment |
| Manufacturer | Circor Aerospace Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| SE50341 PRIMARY | Circor Aerospace Inc (USA) |
| YCA-H-A-2 | Circor Aerospace Inc (USA) |
| Reference | Meaning |
|---|---|
| YCA-H-A-2 | 5/9 Secondary reference Circor Aerospace, Inc. Dba Sei Products |
| SE50341 | 3/9 Design control — primary reference Circor Aerospace, Inc. Dba Sei Products |
NSN 4220-01-561-3564 is a Y-Coupler, manufactured by Circor Aerospace Inc, classified under FSC 4220, Marine Lifesaving and Diving Equipment. Status: active.
NSN 4220-01-561-3564 has 2 manufacturer part numbers on file: SE50341 (Circor Aerospace Inc), YCA-H-A-2 (Circor Aerospace Inc).
Key specifications for SE50341: Special Features: USED FOR FLUIDS OR GASSES. 5/8 INCH HEX. 2 3/4 INCHES DIAGONAL. 11/16 INCHES THICK IN; Part Name Assigned by Controlling Agency: YCOUPLER ASSY; End Item Identification: C130 HERCULES. 0 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.