Perko 1-1/4 Thru-Hull Connection f/ use with Hose Bronze. Flange is machined to fit and grooved to retain bedding compound neck is. threaded to approximately 3/16 inch from flange. Cast bronze, plain or chromed brass. Regular or short length versions. Regular Length- Fits maximum hull thickness up to 2 inches. Short Length- For thin hull sections up to 5/8 inches maximum. Technical Information Regular Length Plain Bronze Hose Size Inches 1-1/4. Mounting Hole Diameter Inches 1-5/8. Maximum Hull Thickness Inches 1-7/8. O.D. Flange Inches 2-3/4. Model Number 0350007DPP. Ship Weight 6.6/12.6 lbs. Made in the USA Flange is machined to fit and grooved to retain bedding compound neck is. threaded to approximately Cast bronze, plain or chromed brass. Regular or short length versions Regular Length- Fits maximum hull thickness up to 2 inches. Short Length- For thin hull sections up Technical Information Regular Length Plain Bronze . Hose Size Inches 1-1/4 Mounting Hole Diameter Inches 1-5/8 Maximum Hull Thickness Inches 1-7/8 O.D. Flange Inches 2-3/4