NTI 83223-1 Low Water Pressure Switch 1/4 in. NPT (All M100(V) models sold in US)(All M100(V) manufactured after 3/20/2008) M100(V), (All ASME stamped Ti100-150 models)(All Ti100-150 models manufactured after 3/20/2008) Ti100, Ti150, (All Lx150, Lx200, Lx300, Lx400 models) Lx150, Lx150E, Lx200, Lx300, Lx400, (All Ti200 models manufactured after 2/1/2008) Ti200, Ts80