Design Master Plumbing allows you to change the size of the arrowhead block on your leaders. To change the size of the leader block, select:
DM Plumbing 
Customization Options Edit Standards List
The Design Master Plumbing Options dialog will appear.
The value entered into the Pipe Leader Arrow Size field represents the actual size in inches that the arrow will be displayed on a printed drawing. A value of 0.18 will draw an arrow that is 0.18 inches long.
