6" Tri Clamp x 30" Column Cooling Coil with Dip Tube Hoses 4" x 48" Tri Clamp Spool Xtra Compression 4" x 48" Tri Clamp Spool Features high flow and deep vacuum with low pump RPM and large oil reservoirs for extended life and reduced maintenance This cooling coil is made out of 304 stainless steel and has a 3 8" diameter coil spiraling from (3) 1 4" FNPT ports on the top with 2 of them connecting to the coil and one of the connecting to the dip tube This column cooling coil is designed to fit in 6" Tri Clamp material columns and allows the user to either chill or heat the column up from the inside which increased the surface area beyond a standard dewaxing jacket and reduces the need for dry ice