THE NON-ELECTRICAL AUTO-PURGER (NEAP) IS LOWER IN COST COMPARED TO OTHER PURGERS.IS ALSO HAS A GREATER AIR RE MOVAL CAPACITY THAN THE ARMSTRONG AND OTHER PURGERS. THE NEAP IS MORE VERSATILE THAN THE SMALL GRASSO PURGER AND HAS NEARLY TEN TIMES THE AIR REMOVAL RATE. THE GRASSO PURGER MUST BE LOCATED DIRECTLY ABOVE THE PURGE POINT. THE NEAP CAN BE LOCATED. IN ADDITION, GRASSO PURGER MUST BE PROTECTED AGAINST RAIN AND OTHER ELEMENTS. SINCE THE NEAP IS NON-ELECTRICAL AND HAS NO EXTERNAL MOVING PARTS, IT CAN BE LOCATED ANYWHERE, REGARDLESS OF THE ELEMENTS.