Sensor Well Used on Raypak models: - 105A, 105B, 155B/C - 185A, 265A, 335A, 405A - 185B, 265B, 335B, 405B - 185B/C, 265B/C, 335B/C, 405B/C - R185, R265, R335, R405 - R185A, R265A, R335A, R405A - Cast Iron - R185B, R265B, R335B, R405B - Cast Iron - 206A, 266A, 336A, 406A - Cast Iron - 207A, 267A, 337A, 407A - Cast Iron