Polyform HTM-2 Black Marine Ribbed Fender 8.5" Diam x 20.5" Tall 84-065-681. Fits boats 20ft to 30ft.

Features
Even wall thickness for maximum strength and durability
Molded-in ribs for strength and abrasion resistance
Reinforced tube ends
Designed for medium-duty use in both permanent protected and unprotected moorings
Unique Polyform valve for years of service