Strong stainless steel thru hull fittings with lasting good looks.Stainless Steel Thru-Hulls with Straight Barb for Hose. Fittings include nut. For above the waterline installation on hulls up to 5/8" thick. Good choice for scupper, sink drain and bilge overboard discharge.DimensionsSizeMax. Hull ThicknessFlange ODSFPLU#Model5/8"5/8"1 5/8"6540SF148588563/4"5/8"1 7/8"6541SF148588641"5/8"2"6542SF148588721 1/8"5/8"2 1/4"6543SF148588801 1/4"5/8"2 1/2"6544SF148588981 1/2"5/8"2 5/8"6545SF14858906