Across International Heavy Wall Short Path Distillation Head with Straight Drain, 2LAi heavy wall 2L short path distillation head with straight drain. Larger vacuum jacket means less heat loss during distillation Increased internal diameter throughout the whole head for more efficient fractioning and condensation of vapor with zero clogging 75% more efficient than its predecessor Fine grinded joints gives you higher ultimate vacuum levels Heavy wall for durability Five sets of vigreux Boil ing flask and distribution ports: 24 40