Description 12 volt vacuum switch is used to open your valve for water flow to your A/C and heat HVAC unit. Normally Closed 12V activated IMPORTANT: Vacuum lines must be hooked up correctly for the water valve to release Ports OD 0.193″ 3-7/8” L x 1- 15/16” W x 3” H Replaces MX Systems/Manex #03-00606 Used with ACHOS005 Vacuum Lines
