Bubble Action Pumps Ltd.
SOL-Perpetua™ Solar Water Heating System Installation Instructions and Operating Manual For Series "A" Pumps
SOL Perpetua™ System Maintenance - The Hand Pump
If the hand pump does not seem to draw a vacuum of 15" Hg., there may be some dirt in it. Remove the end cap and inspect the rubber "O" ring. Clean it if necessary and replace grease with one of similar thickness.