Perko 1-1/8″ 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 versons , Regular Length- Fits maximum hull thickness up to 2 inches, Short Length- For thin hull sections up to 5/8 inches maximum, Regular Length – Plain Bronze Technical Information: Hose Size Inches: 1-1/8, Mounting Hole Diameter Inches: 1-5/16, Maximum Hull Thickness Inches: 1-3/4, O.D. Flange Inches: 2-1/4, Model Number: 035006ADPP, Ship Weight: 4.7/9.0 lbs., ,.