Bronze Skin Fitting Marine Hull Fittings Get Quotes In 24 Hours Part No. Thread Size BSP Inside Dia in MM CONHULL1 1/2″ 13mm CONHULL2 3/4″ 19mm CONHULL3 1″ 25mm CONHULL4 11/4″ 32mm CONHULL5 11/2″ 38mm CONHULL6 2″ 50mm Through hull skin fitting moulded in bronze, with internal lugs for ease of securing. Our Bronze Hull Fititngs and Huill fititngs for marine use come complete with Bronze lock nuts and washers. BSP threaded Bronze Gunmetal Hull fititngs skin fittings can come with Chrome plating also