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Small copper union trap with two sweat ends, straight cylindrical body, shiny metallic finish

Nibco, Inc.

Nibco, Inc. 633W 1/2" Copper Union Trap

SKU CH-NS6G-D6HBF MPN 633W

A straight copper union trap joins two 1/2 in tubes for air, gas or potable water and handles 722 psi at 100 °F

  • TypeDrain Components
  • MaterialHAWA
  • Wrot copper construction resists corrosion
  • 722 psi rating handles high-pressure lines
  • Rated to 400 °F for hot-water service
  • Sweat ends create permanent leak-free joints
  • Straight union allows easy pipe disconnection

Copper union for plumbing systems

The Nibco 633W is a straight sweat-fitting union made from wrot copper. It joins two 1/2-inch nominal copper tubes with cup connections on both ends. The fitting suits air, gas and potable-water lines in residential or light-commercial installations.

Pressure and temperature limits

Rated for 722 psi at 100 degrees F and a maximum operating temperature of 400 degrees F, the union handles typical hot-water and compressed-air duties without deformation. The all-copper construction resists corrosion and does not introduce contaminants into the fluid stream.

Sustained high-temperature service

Under continuous exposure to elevated temperatures the copper body maintains its mechanical strength and seal integrity. The sweat joints remain leak-tight through repeated thermal cycles, making the fitting reliable for long-term service in heating and distribution loops.

Highlights

  • Wrot copper construction resists corrosion
  • 722 psi rating handles high-pressure lines
  • Rated to 400 °F for hot-water service
  • Sweat ends create permanent leak-free joints
  • Straight union allows easy pipe disconnection

Specifications

TypeDrain Components
MaterialHAWA
BrandNibco
Model633W 1/2

Questions about this item

How do I install the 633W union and what step do people miss?

Sweat both 1/2 in copper tube ends into the cup connections using flux and solder; the step often missed is cleaning and fluxing both the tube and fitting interior before heating.

What maintenance or replacement will the 633W copper union need later?

Wrot copper resists corrosion in potable water, air and gas lines; inspect joints periodically for leaks or green patina and re-sweat only if a joint fails.

What limit appears first on the 633W union under sustained high-temperature use?

The fitting is rated to 400 Degrees F; at that temperature the 722 psi pressure rating no longer applies and the joint may soften.

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