Thanks for the post. It actually saves a lot of time when you can suck out the drain(where possible) instead of opening the drain line at the air handler and blowing it out. Check the videos at www.acdrainpump.com they show it in use.
Those folks are some real salesmen if they can hawk those things for that price.
It's the same pump I use to inflate the air mattress I use when I go camping, I bought the pump at Wally's for less than $15.
“Two things are infinite: the universe and human stupidity; and I’m not sure about the universe.” —Albert Einstein
How did I survive 28 years in the trade without one? (just something else to rattle around in my already too small truck) I work on just about anything - can't afford to carry anything that specialized. Could see a use if your work revolved around cleaning drain lines.