Circuit Board, Balboa Duplex Series Cross Reference:1560-97, 474723292, 50669, 50669-C, 50698, 50730, 51085, 51230, 51424, 6300R1A, AJ100R1A, B120DPR1C, DU-SS3, DUH136CCAH, DUPLEXR1A, H136, H311000, H50, J118000, JEM400R1A, ZX500R1A Replacement Boards for Duplex Systems. Any corresponding Duplex panels may be used with these boards.Temp sensor/ hi limit sold separately. Chip Number Note:Balboa produces many different boards for various manufacturers. To correctly identify a replacement board, the chip number near the center of the board would be required.