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Cast bronze solder union with copper finish, one inch size

Nibco, Inc.

Nibco, Inc. 733-3 Cast Bronze Solder Pressure Copper Union 1 Inch

SKU CH-JC7X-0TSGR

Cast bronze solder-pressure union joins 1-inch copper tube to female NPT, rated 395 psi at 200 °F and tested to ASME B16.18

  • Cast bronze body resists corrosion in water lines
  • 395 psi at 200 °F handles high-pressure solder joints
  • Rated from -20 °F to 400 °F for wide temperature swings
  • 1 inch copper sweat to FNPT connects pipe to threaded fittings
  • Meets ASME B16.18 standard for quality assurance

1-Inch Cast Bronze Solder Union

The Nibco 733-3 is a cast bronze solder-pressure copper union designed for 1-inch tube and pipe connections. It joins copper tubing to a female NPT thread in residential, commercial and industrial plumbing systems. The fitting suits installers who need a reliable, detachable joint for water, oil or gas lines rated to the listed pressures.

Thermals, Noise and Power Draw

As a passive mechanical fitting, the union generates no heat, produces no noise and draws no electrical power during operation. Its cast bronze construction withstands a temperature range from -20 to 400 degrees Fahrenheit. The joint maintains integrity at a maximum working pressure of 395 psi at 200 degrees Fahrenheit.

Upgrade Context

This union replaces a permanent solder joint where future disassembly for maintenance or equipment replacement is required. The jump is worth it when a system design demands a leak-tight, reusable connection that meets ASME B16.18 standards. It is not suited for installations where a permanent, non-separable joint is preferred or where larger diameter piping is specified.

How it compares

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

Price $50.99
Pricier than about 81% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameNibco

Questions about this item

How do I solder the 1-1/8 inch outside diameter copper tube into the C connection without overheating the bronze body?

Clean both surfaces, apply flux, heat the fitting evenly until solder flows at 200 degrees F, then remove heat immediately to avoid exceeding the 400 degree F limit.

Will the cast bronze body or the solder joint need replacement first in a hot water system?

The bronze body handles 395 psi at 200 degrees F continuously; the solder joint is the weaker link if system temperature repeatedly spikes above 400 degrees F.

At what pressure does the union reach its rating during extended 200 degree F operation?

The ASME B16.18 rating caps sustained pressure at 395 psi when the fluid temperature holds at 200 degrees F.

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