The DBMX 80 from Septic Sewage Pumps has a long-lasting, heavy-duty diaphragm. The unit runs cooler because its large housing dissipates the heat and the coil does not generate as much heat because the wattage is lower, the maker reports. It is able to use a lower wattage coil because it uses an efficient rare earth magnet in the activating arm. Heat is the main killer for air compressors, and using both the efficient rare earth magnet and a lower wattage coil decreases heat and extends life. 800/292-9087; www.septicsewagepumps.com.