Hi, I'm not sure if it's possible to do this, but I hope somebody can tell me. I live in a street where the landlord supplies the entire street's water supply through a borehole with a combination of inline valves to allow a switch over to the goverment supply if necessary. We quite often have low pressure problems in the mornings and evenings when the demand is at a peak. Does a valve exists that will normally run on the borehole water supply, but automatically supplement the borehole supply if the pressure drops? The main supply pressure is always higher than the output of the borehole pump.