Pentair 42001-0061S Air Flow Switch Used on the following models: MSTRTMP175LP MSTRTMP175NA MSTRTMP200LP MSTRTMP200NA MSTRTMP250LP MSTRTMP250NA Sta-Rite Max-E-Therm 400 LP Sta-Rite Max-E-Therm 400 NA SR400LP SR400NA Sta-Rite Max-E-Therm 200 LP Sta-Rite Max-E-Therm 200 NA Sta-Rite Max-E-Therm 333 LP Sta-Rite Max-E-Therm 333 NA Pentair MasterTemp 400 LP Pentair MasterTemp 400 NA SR200LP SR200NA SR333LP SR333NA Pentair MasterTemp 200 LP Pentair MasterTemp 200 NA Pentair MasterTemp 250 LP Pentair MasterTemp 250 NA Pentair MasterTemp 300 LP Pentair MasterTemp 300 NA MSTRTMP300LP MSTRTMP300NA MSTRTMP400LP MSTRTMP400NA Pentair MasterTemp 175 LP Pentair MasterTemp 175 NA