Whitecap Duplex Stainless Steel Thru-Hull w/ BarbThe Whitecap Duplex Stainless Steel Thru-Hull is available in a variety of sizes to fit a wide range of boats and applications. These Thru-Hulls are constructed of durable stainless still that is more dense and has greater rust resistance than traditional 316 stainless steel. Specifications:Part No.Hose SizeFlange O.D.Thread LengthBarb LengthOverall LengthCut-OutMax Hull Thickness6540X5/8"1-7/8"1"1"2-1/4"1-1/8"5/8"6541X3/4"1-7/8"1"1"2-1/2"1-1/8"5/8"6542X1"1-7/8"1-1/8"1"2-1/2"1-1/2"5/8"6543X1-1/8"1-7/8"1-1/4"1"2-1/2"1-1/2"5/8"6544X1-1/4"1-7/8"1-1/4"1"2-5/8"1-3/4"5/8"6545X1-1/2"3-1/8"1-1/4"1-1/2"3-1/8"1-3/4"5/8"