"Danny D." wrote in message
...

Notice the pipe is actually about 1 3/8ths in diameter, so it's
neither 1 inch nor 1.5 inch.


You do realize that pipe is not really measured like it is called ?
That is what is called one inch pipe will actually measuer about 1.3 inches
outside diameter with a ruler.


http://www.pipemarkers.com/pipe-data.php

This is a pipe chart for sizes.