I recently purchased a Blichmann Boilermaker to replace my old kettle. I installed the brewmometer, filled it with water to check for leaks, and drained it. Once the water level fell below the valve, it didn't seem like the dip tube was picking up any more liquid.. at least not very much (if any at all). Its like it didn't create a syphon while draining. I pulled out the tube and reinserted it to no avail. Is there anything I am missing, or is it just slow going when the liquid level reaches this point?