Blanco 441091 3-1/2" Basket Strainer and Sink Flange (Not for Use with Garbage Disposal)Blanco 441091 3 1 2" Basket Strainer and Sink Flange (Not for use with Garbage Disposal) Missing the finishing touch? Blanco kitchen sink basket strainers perfectly complement Silgranit kitchen sinks. The Blanco sink basket strainer creates a tight seal to prevent food and debris from clogging up your pipes while giving you the option to allow water to drain through ideal for food prep. Making prep work more pleasing and clean up less complicated, the