These bases are slip on fittings and are available for both 1.5" pipe (measures 1 7/8" O.D.) as well as 1.25" pipe (1 5/8" O.D.). They are held in place by set screws which tighten down, firmly, to the pipe they are affixed too. The Down River Oar Tower has a 12 degree angle cast in the head to allow the shaft a perpendicular position in the oar lock without having to tilt the tower out itself. Oar Tower Bases are made to fit on both 1 1/2" (DRE) and 1 1/4" (Gunnison, NRS) pipe.
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 it's 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 refered to as 1.5" pipe