This 4" extension is 510mm long frequently used for adding packing into a column.
Insert between the plate section and your reflux condenser to convert your plated unit into a reflux column. Pack with spiral prismatic packing (SPP), copper mesh, stainless scrubbers etc.
Included is the 4" tri-clamp connections at each end of the 304 grade 510mm stainless stell pipe, a 4" Tri-Clamp, a 4" gasket and a 4" filter screen.
Packing not supplied. Your welcome to add StillDragon's premium copper mesh for your order though.