The Hayward IDXL2BVS1930 Blower Vacuum Switch ensures optimal operation of your Hayward H-Series heater. MPN : IDXL2BVS1930. Manufacturer Part Number : IDXL2BVS1930. This Hayward blower vacuum switch is designed to be used with Hayward H-Series pool heaters, ensuring safe and efficient operation by monitoring pressure levels.