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188-500189-4 — TAILPIECE,UNION

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

188-500189-4: TAILPIECE,UNION.

The TAILPIECE,UNION is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, seat_type: GASKET, overall_length: 3.672 INCHES NOMINAL IN, special_features: W/O-RING, end_connection_type: BRAZED, union_outside_diameter: 5.438 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-117-0990, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
188-500189-4
NSN: 4730-01-117-0990
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 32142 — HYDRASEARCH COMPANY, LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY
seat_typeGASKET
overall_length3.672 INCHES NOMINAL IN
special_featuresW/O-RING
end_connection_typeBRAZED
union_outside_diameter5.438 INCHES NOMINAL IN
end_item_identificationFFG-7 CLASS SHIP
tubing_outside_diameter4.500 INCHES NOMINAL IN
NSN4730-01-117-0990
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 188-500189-4 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
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
TECHNICAL CHARACTERISTICS
UNION OUTSIDE DIAMETER5.438 INCHES NOMINAL IN
END CONNECTION TYPEBRAZED
OVERALL LENGTH3.672 INCHES NOMINAL IN
SEAT TYPEGASKET
TUBING OUTSIDE DIAMETER4.500 INCHES NOMINAL IN
SPECIAL FEATURESW/O-RING
END ITEM IDENTIFICATIONFFG-7 CLASS SHIP
MATERIALCOPPER ALLOY
SUBSTITUTES & CROSS-REFERENCES 3
4730PL1261355Reference document
Same NSN cross-reference
Reference document — Informative reference only
500189-4MReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
500189-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 188-500189-4?
188-500189-4 is a TAILPIECE,UNION.
What parts can replace 188-500189-4?
There are 3 known substitutes for 188-500189-4: 4730PL1261355, 500189-4M, 500189-4. Substitute compatibility should be verified for your specific system.
What is the NSN for 188-500189-4?
188-500189-4 is cataloged in the U.S. Government catalog under NSN 4730-01-117-0990. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.