Our tower bases allow for Down River's Oar Tower to fit in the vertical plane. The horizontal plane allows for two sizes of aluminum pipe, 1.5" pipe (measures 1 7/8" O.D.) as well as 1.25" pipe (1 5/8" O.D.). The size of pipe used is not only referenced by its inside diameter among industry professionals, but that same size designation is used when referencing the appropriate size structural fittings. Example: If you're pipe measures 1 7/8", then it will commonly be referred to as 1.5" pipe
