When the trailer is submerged, the PVC guide rises upward adding an additional 12" in sight with adjustable viewing sight of 24?- 36? overall height. Bright orange end caps on these PVC guides give you a brighter target when loading your pontoon boat. The guide posts are designed to be mounted between the pontoons. Made of 11/2" square, 16-gauge steel galvanized tubing and covered by 2" x 20" PVC pipe. Guide posts extend fully into the PVC tube for additional strength. All mounting hardware included.