How to Fit a Brass Cap Pipe

Written by justin mikulka
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How to Fit a Brass Cap Pipe
Threaded brass pipe fittings have standard dimensions. (adaptor image by sasha from

Brass pipe isn't very common in residential plumbing but brass fittings and threaded pipe caps are used throughout the plumbing in most homes. Brass is an alloy of copper and zinc and is highly resistant to water corrosion. Brass fittings are designed to either be soldered to copper pipe or threaded onto a threaded pipe end. Threaded brass fittings come in standard sizes from 1/8 inch to 12 inches.

Skill level:

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Things you need

  • Tape measure
  • Thread die
  • Cutting oil
  • Vice
  • Adjustable wrench

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  1. 1

    Measure the outside diameter of the pipe threads. For most residential plumbing the diameter is likely to be between 1/4 inch and 1 inch.

  2. 2

    Choose the appropriately sized threaded brass cap.

  3. 3

    Hand-tighten the threaded brass cap on the threaded pipe. Use the adjustable wrench to securely tighten the threaded brass cap.

  1. 1

    Choose a cutting die with a standard National Pipe Thread dimension that will match the threads on the brass cap. Right handed threads are standard in the United States so a right handed thread die should be used to thread the brass pipe.

  2. 2

    Place the brass pipe in the vice so that it is held securely in place but do not over-tighten because brass is a softer metal and can be bent or dented by the vice. Place the thread die on the end of the brass pipe. Turn the die in a clockwise direction to start the thread. Lubricate the pipe with the cutting oil and continue to add more oil after every two rotations of the thread die. While cutting the pipe threads it is good to reverse the threading die at intervals to smooth out the thread cuts. For most threaded brass caps, 5 to 8 threads should be sufficient.

  3. 3

    Hand-tighten the threaded brass cap on the threaded pipe. Use the adjustable wrench to securely tighten the thread brass cap.

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