InSinkErator Extended Steel Garbage Disposer Flange in Polished Stainless Steel # FLG-SSLG. For extra thick sinks, greater than 3/4", use the extended sink flange. Installations on thicker sinks (such as solid surface, porcelain, or cast iron) may require the use of alternate parts. Before removal of old disposer, measure existing mounting to assembly or measure sink thickness to determine whether an extended sink flange must be ordered. Note: Use of abrasive cleaning solutions may harm this product's finish.