pump

I just set up my vacuum chamber (pressure cooker pot with a diaphragm pump.) It holds vacuum well, so well, in fact, that I'd like to not have to run the pump continuously. Anyone know of a reasonably priced programmable vacuum switch so I can turn the pump on and off as needed? Thanks, Gary

I bought my first Fountain Kit, a Traditional from Penn State. Followed the instruction to the letter and the pen came out just fine. The Problem is I had a part left over (always a bad sign). It is not pictured or mentioned in the instructions. Can anyone help me identify it and its...