Get the look of stainless steel without the cost.Stainless steel flange gives these nylon fittings the look of stainless steel without the cost. Nylon fittings like these are an economical alternative to more costly Marelon or bronze but are for above-the-waterline use only. Designed to fit hulls up to 5/8" thick. Uses include scupper, sink drain and bilge pump overboard discharge.Cosmetic upgrade to nylon thru-hullDesigned to fit hulls up to 5/8" thickNot for use below the waterline