Perko 1" Thru-Hull Connection f/ use with Hose BronzeFlange is machined to fit and grooved to retain bedding compound neck isthreaded to approximately 3/16 inch from flange.Cast bronze, plain or chromed brassRegular or short length versionsRegular Length- Fits maximum hull thickness up to 2 inchesShort Length- For thin hull sections up to 5/8 inches maximumTechnical Information Regular Length - Plain Bronze:Hose Size Inches: 1Mounting Hole Diameter Inches: 1-5/16" Maximum Hull Thickness Inches: 1-3/4"O.D. Flange Inches: 2-1/4"Model Number: 0350006DPPShip Weight: 4.7/8.6 lbs.Made in the USA