Polycarbonate (Pc) Vacuum Bell Jar with Base, Sound Physics Demonstration

I use this once or twice a year for classroom demonstrations. The plastic bell cracked after only several uses. Would like to replace with a glass bell or I might have to start from scratch.

Pulled some nice vacuum with this, for high school science experiments. There is another bell jar on Amazon which we also use, branded Thermo Fisher; that one is a little larger, but they do the same job for us. And this one is more affordable.