Perko 2" Thru-Hull Fitting w/ Pipe Thread Bronze. Flange is machined to fit hull and grooved to retain bedding compound. Neck is threaded to approximately 3/8 inch from flange.. Cast Bronze.. Technical Information:. Pipe Size Inches: 2. Mounting Hole Diameter Inches: 2-3/8. Maximum Hull Thickness Inches: 2-3/8. O.D. Flange Inches: 3-5/8. Model Number: 0322009PLB. Ship Weight: 2.1/19.4 lbs.. MADE IN THE USA