Conversion kit for older Portapac Electronic control systems that utilized the wc axsk512a PCB and 45551261 touchpad. This kit includes the complete control box assembly, touchpad and temperature sensor required to convert/upgrade your older system to the current system. Your old 45551261 touchpad or axsk512a PCB is not compatible with the new circuit board or touchpad, therefore the complete new conversion kit is required / included. Suits 4555130, 4555135 pumps - converts to 4555130E, 135E - suits both 10A and 15A models A different conversion kit is also available for 4555137 to 4555137E Can also be used to upgrade an airbutton operated system such as 4555100, 4555100E, or 4555140, to a touchpad system.