Originally Posted by JimN
My original one worked fine until something happened and the glass bead inside chipped. It stopped pulling vacuum and actually fell out, so I replaced it. I'm pretty sure the more expensive ones have a stainless ball inside.
That's what you get from Harbor Freight. I think I only paid about 6 or 7 for mine and it has a stainless ball in it. Works great for me. As I recall though, the HF one had a larger tube. Don;t quote me on that though.