NTI 85163 Blocked Condensate Drain / Blocked Vent Switch Tft60, Tft85, Tft110, Tft154, Tft155, Tft175, Tft200, Tft201, Tft250, Tft285, Tft300, Tft340, Tft399, VM110, VM110P, VM153, VM153P, FTV110, FTV110C, FTV150, FTV150C, FTV190, FTV190C, FTG 600, FTG 800, FTG 1200, FTG 1400