Our stainless steel flute column - 4 inch is built from 304 stainless steel. The high quality distilling column has a 4-plate tower and uses copper bubble plates to increase the proof output to around 175. Additional sections can be added to increase proof output. The column comes with dephlegmator, shotgun condenser and proofing parrot. It can be run as a pot still by removing the plates and/or shortening the tower by removing some sections.