Plastic 2'' H x 7.7'' W x 9.4'' L

This Air Flow Switch Replacement Part by Pentair is designed to use with Pentair MasterTemp, Pentair MasterTemp 125, and Sta-Rite Max-E-Therm pool and spa heater electrical systems. The switch fits Pentair MasterTemp pool and spa heater electrical systems. The airflow switch by Pentair senses the pressure drop across the air metering orifice. It's a safety device used to insure that the combustion air blower fan is operating and has been designed to monitor the vacuum pressure within the blower housing. The switch replacement will have your heating system back up and running in no time.Trust your replacement parts for any of your spa or pool equipment is of the highest quality when you choose Pentair.