oekick port option for 2X4 wall construction, works with all powerpipe subwoofers, except the 1500PTM. The tube size is 4” and has a 90 degree entry. Unit has a 3” x 14” in-room opening and a 6" clearance from flange edge to tube. Has an overall toekickdepth of 13.5" (343mm) - generally used for behind wall mounting.