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Small bronze sweat union fitting with threaded end, straight cylindrical shape, dull gold finish

Nibco, Inc.

Nibco, Inc. 7333-LF 1/4 in Sweat Union Fitting

SKU CH-NN4E-GXVXX

A low-lead cast bronze sweat union for 1/4 in copper tube, rated 729 psi and 200 °F for potable water systems

  • Lead-free bronze meets NSF/ANSI 372 for safe drinking water
  • Rated to 729 psi for high-pressure plumbing systems
  • Withstands 200 Degrees F in hot-water service
  • Sweat-to-FNPT union joins copper tube to threaded pipe
  • Certified to ASME B 16.18, NSF/ANSI 61 and ISO 9001

1/4-Inch Sweat Union for Potable Water

The Nibco 7333-LF is a straight union fitting made from low-lead cast bronze grade C87850. It joins a 1/4-inch copper tube on one side to a 1/4-inch female NPT thread on the other. The fitting meets ASME B16.18, NSF/ANSI 61 and NSF/ANSI 372 standards for potable water systems.

Verify Tube Size and Thread Compatibility

Confirm the existing copper line has a 3/8-inch outer diameter to match the sweat cup. Ensure the mating component uses a 1/4-inch male NPT thread for the female side. The joint is rated for 729 psi at up to 200 degrees F, so check that system pressure and temperature stay within these limits.

Cast Bronze Body with Sweat and Threaded Ends

The cast copper construction resists corrosion in potable water applications. One end requires soldering to the copper tube, while the other accepts a threaded pipe or adapter. This union allows the connection to be broken for maintenance without cutting the copper line.

Highlights

  • Lead-free bronze meets NSF/ANSI 372 for safe drinking water
  • Rated to 729 psi for high-pressure plumbing systems
  • Withstands 200 Degrees F in hot-water service
  • Sweat-to-FNPT union joins copper tube to threaded pipe
  • Certified to ASME B 16.18, NSF/ANSI 61 and ISO 9001

Specifications

BrandNIBCO

Questions about this item

Does the 7333-LF sweat union come with solder or flux, or must they be purchased separately?

The fitting is supplied alone; solder and flux for the 1/4 in sweat connection are not included and must be sourced separately.

The listing shows only one size — 1/4 in copper tube with 1/4 in FNPT — so how do I decide which version to choose?

This model is a single straight union in 1/4 in CTS by 1/4 in FNPT; select it when that exact pipe-to-thread transition is required.

What does the 729 psi rating mean for a residential potable-water system running at 200 °F?

The union is rated for 729 psi at up to 200 °F, well above typical residential pressures, and meets NSF/ANSI 61 and 372 for potable water.

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