This listing is for one ignition control module for a gas fired pool/spa heater. Please make sure that the numbers on your module match the ones in the listing as they are not interchangeable. These modules all came from heaters with leaking exchangers but were otherwise in good working condition. The Current Inventory is as follows. Fenwal 35-662903-003 four in stock. Fenwal 05-339018-103 two in stock. Fenwal 35-662902-113 two in stock. Also see my other listings for other heater parts , or ask me if you don’t see what your looking of. I may have what your looking for unlisted. The item “Hayward, Pentair, Ignition Control Module, Pool / Spa Gas Heater, Heater Parts” is in sale since Tuesday, October 13, 2015. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Pool Equipment & Parts\Pool Heaters & Solar Panels”. The seller is “yourpropoolspaparts” and is located in Saint Louis, Missouri. This item can be shipped to United States.