I like to find a pump that self primes, sits in my kitchen sink, connected to the tank water with either garden hose or 1/2' or larger diameter clear tubing. I just need to turn the pump on, no priming by me required, to start vacuum water out. Any recommendations? Today I use a mag 7 pump, which has to submerge under water. I constantly worry about losing vacuum, and it is also hard to maneuver.