Our economy vacuum chambers feature a space saving design which provides maximum interior clearances and extra heavy walls for shatterproof durability. Clear polycarbonate construction for viewing will hold a full vacuum (29+" Hg [759mm]) at room temperature for 24 hours and will remain air tight even if not under vacuum. Sold complete with 1/4" isolation / vent valve and removable tray. Great for medical, dental or lab experiments as well as degassing resins and epoxies. Size - 8 1/4" HT X 6 3/4" O.D.