For use with models Lx150, Lx150E, Lx200, Lx300, Lx400, Lx500, Lx600, Lx700, Lx800, Tft60, Tft85, Tft110, Tft154, Tft155, Tft175, Tft200, Tft250, Tft300, Tft340, Tft399, Tx51, Tx81, Tx101, Tx151, Tx151C, Tx200, Tx200C, VM110, VM110P, VM153, VM153P condensing gas boiler|Pipe sensor Lx/Tft