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Bronze straight union with cup and male threaded ends

Nibco, Inc.

Nibco, Inc. 7334LF Bronze Union 1/4 Cup MNPT

SKU CH-2E33-PKF0N

Bronze sweat-union fitting joins ¼-inch copper tube to ¼-inch MNPT for potable water at up to 729 psi and 200 °F

  • Potable-water safe with NSF/ANSI 61 Annex G certification
  • Bronze construction resists corrosion per ASTM B584 standard
  • 729 psi rating handles high-pressure plumbing systems
  • 200 Degrees F max temperature suits hot-water lines
  • ASME B 16.18 compliant for reliable sweat connections

Bronze Union for Potable Water

The NIBCO 7334LF is a straight sweat union that joins 1/4 inch copper tube to a 1/4 inch male NPT thread. Its bronze body meets ASME B16.18, ASTM B584 and NSF/ANSI 61 Annex G for potable water service.

Suits copper-to-thread transitions.

Plumbers connecting small-bore copper lines to threaded valves or equipment will find the 1/4 inch cup and MNPT ends a direct fit. Installers needing 3/8 inch or 1/2 inch tube sizes must select a different union.

Rated for 729 psi at 200 Degrees F sustained

The bronze construction holds the listed pressure and temperature continuously without derating. Joint integrity depends on proper soldering of the cup end and correct thread engagement on the MNPT side.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $23.99
Pricier than about 60% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameNIBCO

Questions about this item

What copper tube size must I already have to sweat the cup end of the 1/4 in Nibco 7334LF union?

The cup end is sized for 1/4 in copper tube, which has a 3/8 in outer diameter, so you need that exact tube size for a proper sweat joint.

Will the MNPT threads on the 1/4 in Nibco 7334LF union mate with existing 1/4 in NPT pipe in my system?

Yes, the Side B connection is 1/4 in MNPT, matching standard 1/4 in NPT pipe threads for a direct threaded joint.

After installation, how can I verify the 1/4 in Nibco 7334LF union is holding pressure correctly?

Pressurise the line up to the 729 psi rating and inspect both the sweat and threaded joints for leaks; the union meets ASME B16.18 and NSF/ANSI 61 Annex G for potable water service.

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