The size of the pipe (in mm) is specified by clicking the Bore up/down arrows. The available trunnion bores for the selected trunnion type and pipe bore are shown in the Avail. bores list.

To make a particular trunnion bore size available to the MDS designer, click on the item in the Avail. bores list then click on the left arrow icon on the left side of the list. This transfers the item to the adjacent Trunn. Bore list. Clicking on the right arrow, reverses the action. Each bore for any of the MDS trunnion types may have one or more trunnion bores set as the supplied MDS defaults. The maximum trunnion bore size is normally one pipe bore size less than the main pipe bore size.