Perko 3/4' 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: 3/4 * Mounting Hole Diameter Inches: 1 * Maximum Hull Thickness Inches: 1-5/8 * O.D. Flange Inches: 1-7/8 * Model Number: 0350005DPP * Ship Weight: 2.9/5.5 lbs. * Made in the USA