The Tailpiece,union, cataloged under National Stock Number 4730-01-117-0990, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Hydrasearch Company, Llc. Government technical data includes 5 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4730-01-117-0990 |
| Primary Part Number | 188-500189-4 |
| Item Name | Tailpiece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Hydrasearch Company, Llc |
| Status | ACTIVE |
| Union Outside Diameter | 5.438 INCHES NOMINAL IN |
| End Connection Type | BRAZED |
| Seat Type | GASKET |
| Tubing Outside Diameter | 4.500 INCHES NOMINAL IN |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| 188-500189-4 PRIMARY | Hydrasearch Company, Llc (USA) |
| Reference | Meaning |
|---|---|
| 188-500189-4 | 3/9 Design control — primary reference Danfoss Power Solutions II, Llc |
| 4730PL1261355 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 500189-4M | C/1 Advisory reference — outside the item-of-supply concept Danfoss Power Solutions II, Llc |
| 500189-4 | 5/9 Secondary reference Danfoss Power Solutions II, Llc |
NSN 4730-01-117-0990 is a Tailpiece,union, manufactured by Hydrasearch Company, Llc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-117-0990 has 1 manufacturer part number on file: 188-500189-4 (Hydrasearch Company, Llc).
1 possible match (shared part number, not a government interchangeability claim): 5930-01-322-0903. Verify interchangeability with system specifications before substitution.
Key specifications for 188-500189-4: Union Outside Diameter: 5.438 INCHES NOMINAL IN; End Connection Type: BRAZED; Overall Length: 3.672 INCHES NOMINAL IN; Seat Type: GASKET. 5 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.