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