Sorry for the innappropriately placed post (probably should go in the equipment forum), but SWIA figured I'd getter a better response in this one, so any help would be greatly appreciated. I know from the 'literature' that when performing reflux say, in the event of an RP/I reduction, a condenser of the straight central tube variety is used with efficiency... SWIA has also seen Allihns work very well. However, a friend of SWIA obtained a condenser of the coiled inner tube variety, wherein the coolant flows thru the inner coil. What is this type of condenser called, and can it be used with the same efficiency? And if so, would there be any difference in how one would perform the reaction i.e. longer reflux time, etc?? Any elaboration would be appreciated Bees.