It is a size 10 rubber stopper

• Made of stainless steel with brushed finish
• Has cutout for 3" tower base flange
• Stainless steel cover is easily removable for cleaning
• Dimensions: 12" L x 7" W x 3/4" H
• Cutout dimensions - 5" W x 2" D

Made of stainless steel with brushed finishHome Brew Stuff