Perko 1 Thru-Hull Connection f/ use with Hose Chrome Plated. 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 Chrome Plated Bronze Hose Size Inches 1. Mounting Hole Diameter Inches 1-5/16 . Maximum Hull Thickness Inches 1-3/4 . O.D. Flange Inches 2-1/4 . Model Number 0350006DPC. Ship Weight 4.6/8.4 lbs. Made in the USA 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 Hose Size Inches 1 Mounting Hole Diameter Inches 1-5/16 Maximum Hull Thickness Inches 1-3/4