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Cast bronze copper union coupling with solder ends, 1/2 inch size

Nibco, Inc.

Nibco, Inc. 733-3 Cast Bronze Solder Pressure Copper Union coupling 1/2

SKU CH-NTWQ-4E6KQ

Cast bronze union with solder connection for 1/2 inch copper pipe repairs, rated for higher pressure than standard fittings and dezincification resistant

  • Suitable for residential and commercial plumbing systems
  • Higher pressure rating than most wrot copper fittings
  • Allows line repair without pipe damage
  • Dezincification resistant cast bronze construction
  • 50-yr limited manufacturer's warranty
  • 733 model series fitting union

1/2" Cast Bronze Union for Copper Pipe Repairs

This Nibco 733-3 union connects 1/2" copper tubing using a solder joint on one end and a female NPT thread on the other. It is built for nondrinking water and air lines in residential and commercial plumbing systems. The cast bronze body resists dezincification for long service life. The union design lets you disconnect the line for repairs without cutting the pipe.

Higher Pressure Rating Than Standard Wrot Copper

This fitting carries a higher pressure rating than typical wrot copper couplings, making it suitable for demanding supply lines. The upgrade is worth it when the installation requires a durable, separable joint that can handle elevated pressures. The dezincification-resistant alloy adds reliability in aggressive water conditions. A 50-yr limited manufacturer's warranty backs the construction.

Comfortable for Standard Residential Supply Lines

The union handles typical residential and commercial water and air pressures with ample headroom. It runs out of spec if system pressure exceeds the rated limit for cast bronze solder-joint fittings. The solder end requires proper flux and heat technique to avoid leaks. The threaded end needs compatible male NPT threads and sealant for a tight seal.

How it compares

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

Price $17.99
Typical for this category: the median of 2,955 items is $17.99.

Specifications

Product
Brand nameNibco

Questions about this item

What pipe diameter does the 1/2" CxFNPT union connect to?

The union joins 1/2" copper tube on the solder end and 1/2" female NPT threads on the other.

Which step is most often missed when soldering the copper end?

Clean both surfaces with emery cloth, apply flux, heat the fitting evenly, then feed solder until it flows around the full joint.

When should the bronze union be inspected or replaced?

Check for leaks or corrosion during routine system checks; the manufacturer backs it with a 50-yr limited warranty.

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