Perko 1-1/8" Thru-Hull Fitting f/Hose Narrow Flange - Plastic. Not recommended for use below the waterline. Dimensions include Hose Size: 1-1/8" Mounting Hole Diameter: 1-5/16" Max Hull Thickness: 1-1/2" and Flange OD: 1-7/8". Features/Specifications: Molded white polymer thru-hull connection For use with hose Not for use below the waterline 1-1/8" hose size Features of Perko 1-1/8" Thru-Hull Fitting f/Hose Narrow Flange Molded white Narrow Flange : Hose Size: 1-1/8" Mounting Hole Diameter: 1-5/16" Max. Hull Thickness: 1-1/2" O.D. Flange: 1-7/8" Package Contents: Perko 1-1/8" Thru-Hull Fitting f/Hose Narrow Flange Perko 0301DP6A: 1-1/8" Thru-Hull Fitting f/Hose Narrow Flange - Plastic