The Hydrotech 44302303 is the correct replacement control module for the following water filter systems:
The Pura 120 Volt NO UV20/UVB Series Control Module is a replacement control module for the Pura UVB and UV20 Series water filtration systems. This water filter controller can only be used with UV water filter systems that include an NO solenoid valve ("Normally Open") or an audible alarm. This 120 volt controller ensures that your UV filter system operates at peak capacity.
Pura 120 Volt NO UV20/UVB Series Control Module specifications: