How To Determine What Pipe You Already Have

The Following Is A Simple Way To Configure Pipe Size.

  1. Wrap a piece of string around the fully exposed pipe in question one time.
  2. Measure the length it takes to wrap around the pipe once.
  3. Match your measurement with the lengths listed below to get a pipe size.
Nominal Pipe Size Approximate String Length in Inches
Copper Pipe Galvanized PVC Pipe
1/2″ 2″ 2 5/8″ 2 5/8″
5/8″ 2 3/8″ na na
3/4″ 2 3/4″ 3 5/16″ 3 5/16″
1″ 3 1/2″ 4 1/8″ 4 1/8″
1 1/4″ 4 5/16″ 5 3/16″ 5 3/16″
1 1/2″ 5 1/8″ 6″ 6″
2″ 6 3/4″ 7 7/16″ 7 7/16″

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