Bell Jar 9" x 8" For Vacuum Casting MachinesPepetools high quality bell jars are manufactured from acrylic for lasting use. Perfectly clear to see through when running a cycle Thick, sturdy walls Heavy bottom rim cut ground and smooth to create a perfect seal Safety instructions: For an optimum seal, keep the bell jar rim and vacuum table clean of investment debris. Never use a chipped or damaged bell jar. Never press or hit the bell jar during vacuum. It's under tremendous pressure and can