After many, many, many brews, you may want to replace the silicone parts of the Clear Beer Draught System (they will last a long time, you will not constantly be buying replacements). The Tune Up Kit consists of 4 pieces of cut to length food grade silicone tubing, 4 food grade silicone end caps and 4 food grade silicone O rings used for positioning the bracket on the S/S tubing. Also included are 4 S/S bracket attach screws in case you lose 1. If you wish to source the screws yourself, the dimensions are 8/32 thread size by 3/16 inch length.