Alex, I've taken Hypro roller pumps apart, reversed the direction of rotation, found that even a badly corroded roller pump can be pretty easily fixed if you have a sandblast cabinet to clean all the parts good, but like you, I haven't found anything to tell me what kind of suction head they can handle /forums/images/graemlins/frown.gif and I've only used one where it was drawing from a tank with little or no suction necessary. So, I really can't help you this time. I would think it could pull a pretty good head if it were primed first, but that's really only a guess.