The Pura 89520 is the correct replacement UV sensor for the following filter systems:
The PURA 89520 Replacement UV Sensor - UVSS-6M & 10M fits the Pura UVSS-6M and UVSS-10M ultraviolet water disinfection systems. This Pura sensor detects the discrete 254nm wavelengths of the UV lamp, and relays this information to the controller. The UVSS-6M Sensor will indicate when the UV bulb loses effectiveness.
PURA 89520 Replacement UV Sensor - UVSS-6M & 10M specifications: