These will break under the following conditions...-You tighten or unscrew it by grabbing onto the ports-You tighten a plastic ball lock fitting, or any of the wedge seal fittings, and then pour hot liquid into itI know Kegland wants to move away from the BPA, but in this case, I wish I just had a polycarbonate version of this. I have to say though, the design and utility of this thing is really awesome for the price