Heated Product Shelf Chambers with Valves. For bulk drying and flask drying. Eight ports accommodate both 1/2″ and 3/4″ flask adapters. Includes 12″ dia. acrylic cylinder and base, 10″ dia. removable shelves, and temperature probes. Controlled heat settings -20C (-4F) to +50C (+140F). Shelves do not cool.