Save money! Purchase a complete vacuum chamber system. Safe polycarbonate bell jar is 6" in diameter, stands 9" tall and has excellent chemical resistance. Clear plastic allows for easy observation of air pressure effects. Vacuum plate is also polycarbonate plastic with an outside diameter of 7½". The side-mounted tubing adapter accepts ¼" i.d. vacuum tubing (AP8789). For use with (AP1712 or AP1597) vacuum pumps.