Is the answer offset, travel, run or engagement

The diagonal distance between two parallel pipes in plumbing is what?
Offset, run, travel or engagement

Might you mean the perpendicular distance between two parallel pipes? If so, offset is the most logical answer.

Hi all:

To transition from one pipe to another parallel pipe you will need to OFFSET the pipe between them.

Here, as an example, you might measure 12" from center of one pipe to the center of the other pipe. You would then multiply 12" x 1.41 and then deduct for center to make up of two 45 degree fittings to determine the OFFSET pipe to be cut and installed in between two 45 degree fittings to join the two parallel pipes together.

Let us know if you have any questions... OK?

Mark