I was looking around CraigsList and came across a used BlueLine 70 HD for $100. The owner does not know the age or any problems with it. Is there and stamp on the pump that I can determine the mfd or are their any known problems with these pumps? Any recommendations on a different external pump or if anyone has an old pump laying around that puts out 1000gph(more or less) at 7'. Any input is helpful.