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Copper union trap fitting with C x C connections

Nibco, Inc.

Nibco, Inc. 633W Union Trap 3/4

SKU CH-A43D-F8F30 MPN 633W

A copper union trap with a 3/4-inch connection for reliable plumbing joints

  • TypeDrain Components
  • Copper construction avoids leaching toxins into water supply
  • Union design enables quick disconnection for maintenance tasks
  • 3/4 inch tube size fits standard plumbing connections
  • Wrot copper material resists corrosion over long service life
  • Model 633W ensures compatibility with Nibco system components

Copper Union for Plumbing Systems

The Nibco 633W is a copper union designed for sweat connections in residential and commercial plumbing installations. Its 3/4 inch tube size suits standard water supply lines where a detachable joint is required. The wrought copper construction provides a lead-free pathway for potable water.

Capacity and Headroom

The fitting joins two 3/4 inch copper tubes using soldered cup ends, creating a permanent seal on each side of the union nut. It handles typical domestic hot and cold water pressures without restriction. The union nut allows the joint to be broken for maintenance or fixture replacement without cutting pipe.

Build Quality and Daily Implications

Wrought copper resists corrosion and does not introduce contaminants into the water stream. The ground joint union design uses a metal-to-metal seat that seals when the nut is tightened, requiring no gasket that can degrade over time. Sweat installation demands a torch and flux, so the fitting is intended for installers equipped for copper soldering work.

Highlights

  • Copper construction avoids leaching toxins into water supply
  • Union design enables quick disconnection for maintenance tasks
  • 3/4 inch tube size fits standard plumbing connections
  • Wrot copper material resists corrosion over long service life
  • Model 633W ensures compatibility with Nibco system components

Specifications

TypeDrain Components
BrandNibco
Model633W 3/4

Questions about this item

Will the 633W union join directly to my existing 3/4 inch copper piping without adapters?

The 633W union uses a C x C connection designed for 3/4 inch copper tube, so it sweats directly onto matching pipe.

How can I confirm the 633W union is sealed correctly after soldering the joints?

Pressurise the line and inspect both solder joints; a properly made joint shows a continuous fillet of solder with no drips or gaps.

Does the 633W union arrive as a single assembled piece or do I need extra parts to complete it?

The 633W union is supplied as one complete wrought copper assembly including the nut, tailpieces and seat.

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