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Small straight copper union fitting with sweat cup ends

Nibco, Inc.

Nibco, Inc. 633W 3/8" Copper Union Trap

SKU CH-87H7-JBJT9 MPN 633W

A wrot-copper straight union rated for 779 psi at 100 degrees F and 400 degrees F maximum temperature

  • TypeDrain Components
  • MaterialHAWA
  • Wrot copper construction resists corrosion in potable water systems
  • Sweat cup connections on both ends simplify copper tube installation
  • Rated for 779 psi at 100 degrees F for high-pressure air or gas lines
  • Withstands 400 degrees F continuous operating temperature in demanding applications
  • Straight union design joins two 3/8 inch nominal copper tubes directly

Copper Union for Sweat Fitting

This 3/8-inch nominal copper union connects two equal tube sizes using sweat fittings on both ends. It is suited for air, gas or potable-water lines where a straight, demountable joint is required. The wrot-copper body withstands 779 psi at 100 degrees Fahrenheit and temperatures up to 400 degrees Fahrenheit.

Verify Tube Size and Sweat-Fitting Skill

Confirm that both pipe runs are 3/8-inch nominal copper with 1/2-inch outer diameter before ordering. The joint is made by sweating, so a torch, flux and lead-free solder are needed. Ensure local code permits sweat unions for the intended fluid and pressure class.

No Extras Included

The fitting ships as a single union body without flux, solder, pipe hangers or thread-seal tape. Installers must supply their own brazing materials and any required support hardware. There are no gaskets, O-rings or adapters in the package.

Highlights

  • Wrot copper construction resists corrosion in potable water systems
  • Sweat cup connections on both ends simplify copper tube installation
  • Rated for 779 psi at 100 degrees F for high-pressure air or gas lines
  • Withstands 400 degrees F continuous operating temperature in demanding applications
  • Straight union design joins two 3/8 inch nominal copper tubes directly

Specifications

TypeDrain Components
MaterialHAWA
BrandNibco
Model633W 3/8

Questions about this item

What comes in the box with the Nibco 633W copper union trap, and do I need to buy solder or flux separately?

The box contains the wrot copper union trap with 3/8 inch cup connections on both ends. Solder and flux for sweat fitting installation are not included and must be purchased separately.

How do I choose between the available versions of the 633W fitting for my plumbing job?

The 633W model is supplied in a single 3/8 inch nominal copper tube size with straight union configuration. No alternative capacities or shapes are offered for this part number.

What does the 779 psi pressure rating mean when the union is installed in a hot water line?

The 779 psi maximum operating pressure is rated at 100 degrees F. At higher temperatures up to the 400 degree F limit, the allowable pressure decreases according to copper piping standards.

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