This pump is a linear-shuttle style pump. I've used it w/ very good results in a multi tank system. I have made a manifold system for up to 16 gang valves that can be individually turned on or off and even adjusted for pressure. I've made this from drip irrigation manifolds. I've had the pump for around 1.5 years, but I've only used it for a combined 6 months. Its in use right now if any one wants to view.
The link below is a spec sheet for this model.
http://www.nitto-europe.com/pumps/ac_series/ac0602/index.html
The link below is a description of the technology involved.
http://www.nitto-europe.com/technology.html
Make a free website at Freewebs.com