Perko 1-1/2 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 1-1/2. Mouting Hole Diamete Inches 1-7/8. Maximum Hull Thickness Inches 2-1/4. O.D. Flange Inches 3. Model Number 0322DP8PLB. Ship Weight 7.6/15.0 lbs. MADE IN THE USA Flange is machined to fit hull and grooved to retain bedding compound. Neck is threaded to approxim Technical Information . Pipe Size Inches 1-1/2 Mouting Hole Diamete Inches 1-7/8. Maximum Hull Thickness Inches 2-1/4 O.D. Flange Inches 3. Model Number 0322DP8PLB Ship Weight 7.6/15.0 lbs. MADE IN THE USA