Perko Thru-Hull Connector 3/4" White 0328-DP-5 by Perko $4.57 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Perko Thru-Hull Connector #9-0328DP5 Hose: 3/4". Flange OD: 1-7/8". Max hull thickness: 1-7/16". White Molded Plastic with broad flange. Designed for installation above the water line only.