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