Perko 1-1/2″ 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: 1-1/2, Mounting Hole Diameter Inches: 1-7/8, Maximum Hull Thickness Inches: 1-7/8, O.D. Flange Inches: 3-1/8, Model Number: 0350008DPC, Ship Weight: 8.2/16.1 lbs.,