Polyform HTM-4 Fender 13.5" x 34.8" - Blue w/Adapter [HTM-4 BLUE W/AIR ADAPTER]HTM 4 Fender 13. 5" x 34. 8" Blue with Adapter In keeping with the Polyform tradition of quality, the HTM (hole through middle) boat fender was designed to provide maximum protection in a wide variety of applications. Vertical ribs for extra protection, reinforced tube ends to prevent lines from pulling through if the fender gets caught in a tight spot, and extra wall thickness to resist punctures and tears are just a few of the features of this high