HDH-1 Distilling Head One piece distilling head unit with liebig condenser with thermometer pocket B14 Also available with sealed Thermometer pocket).

HDH-2 Distilling Head, One piece design with double surfaced condenser with vacuum port. HISIL HP-14 also available with sealed thermometer Pocket)

HDH-3 Distilling head – One piece design with liebig condenser with vacuum port J.P. B 14 HISIL also available with sealed Thermometer pocket).

HDH-4 Distilling head – One piece design with double surface condenser with vacuum & multiple neck.

HDH-5 Distilling head, Short path distillation head with permanently fixed cold fingers vertical side tube side angle socket for thermometer.