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Copper closet flange with cup and flange ends, shiny metallic finish

Nibco, Inc.

Nibco, Inc. C 951 4X3 Wrot Copper Closet Flange 4 in x 3 in

SKU CH-12WB-T40GF

A wrot copper closet flange with a 4 in cup and 3 in flange for air or non-potable water systems rated to 400 Degrees F

  • Wrot copper construction resists corrosion
  • Sweat cup connection creates a leak-tight joint on 4 in copper tube
  • Flange face accepts 3 in closet bend for toilet installation
  • Rated to 400 °F for high-temperature non-potable water or air lines
  • 75 in flange OD provides secure anchor points for floor mounting

Copper Closet Flange 4×3

This NIBCO wrot-copper closet flange connects a 4 in copper tube to a 3 in flange for non-potable water and air lines. The sweat-fitting cup on the tube side and the flanged outlet provide a permanent, leak-tight joint in residential and light-commercial plumbing. It is intended for installers who need a direct copper-to-flange transition without intermediate adapters.

Replaces Threaded or Compression Transitions

The single-piece copper construction eliminates the need for separate threaded adapters, compression couplings or dielectric unions when joining 4 in tube to a 3 in closet flange. The jump is worth it when the system operates up to 400 Degrees F and 5 psi, because the all-copper path resists corrosion and thermal cycling better than mixed-metal assemblies.

Fits Standard 4 in Copper Tube

The cup accepts 4 1/8 in outside-diameter copper tube, while the 6.75 in flange bolts to a 3 in closet horn or floor fitting. No additional gaskets or sealants are required beyond standard solder and flux, freeing up space in tight joist bays and reducing the number of potential leak points in the rough-in.

Highlights

  • Wrot copper construction resists corrosion
  • Sweat cup connection creates a leak-tight joint on 4 in copper tube
  • Flange face accepts 3 in closet bend for toilet installation
  • Rated to 400 °F for high-temperature non-potable water or air lines
  • 75 in flange OD provides secure anchor points for floor mounting

Specifications

BrandNIBCO

Questions about this item

What size copper pipe does the 4-inch cup end of the C 951 4X3 closet flange accept?

The cup end is sized for 4-inch copper tube, which has a 4 1/8-inch outer diameter, and it is joined by sweating the fitting onto the pipe.

How is the wrot copper closet flange installed, and what step is often missed?

Clean both the pipe and the fitting cup, apply flux, slide the flange onto the 4-inch pipe, then sweat the joint with solder; the step often missed is thoroughly cleaning and fluxing both surfaces before heating.

When should the C 951 4X3 closet flange be inspected or replaced?

Inspect the sweat joint and flange face whenever the toilet is removed or if leaks appear at the base; replace the flange if the copper shows corrosion, cracking, or if the 6.75-inch flange face is warped.

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