There is a wizard built into the piping module that allows you to create
your own standard parts, and easily specify attachment points, pipe
insertion lengths, thread depths etc.. For instance, you can also specify
the number of attachment points (i.e 2 for an elbow, 3 for a tee)
It works quite well and it allows you to build your own parts into the
library so that they can be used with the piping module.
Hope this is of use
Rory