Standard Thread has full length thread for thick hulls and easy tightening * Hose Size: 1 1/4" I.D. * Flange Dia.: 2 3/4" * Thread O.D.: 1 5/8", Thread Length: 2 1/2", Barb Length: 1 1/4", Total Length: 4 1/4" * Install. Hold size: 1 3/4", Thread NPSM: 1 1/4", Max Hull Thickness: 1 7/8"