Perko 1″ 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: 1, Mounting Hole Diameter Inches: 1-5/16″ , Maximum Hull Thickness Inches: 1-3/4″, O.D. Flange Inches: 2-1/4″, Model Number: 0350006DPP, Ship Weight: 4.7/8.6 lbs.,