This ForgeFit 304 stainless flat tri-clover reducer goes from 4" down to 1.5" and stands just 1.5" tall. This is a direct replacement for 4" triclamp fermenter or Kegmenter lids. It allows you attach a cooling system like the Coolstix to your fermenter with a 4" triclamp connection. It is a direct replacement to the lid that comes on our Kegmenter and can also be used to attach a distillation column.