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., ,.