Model 3303 and 3304
Air-Control™ Valve to Master-Trol® Retrofit
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Retrofit valve assembly includes all components required to convert an Air-Control™ valve assembly to Master-Trol®. Complete with solenoid valve assembly (Brass or Plastic), Pushbutton(s) if required, and station wires. Retrofit works with existing or optional new Master-Trol® systems.

