The Pura 36001021 is the correct replacement audible alarm for the following NO/LOC UV filter systems:
The PURA Audible UV Filter Alarm - 120v For NO/LOC is an audible alarm that emits a high-pitched pulse tone and monitors visible light output. This filter alarm is battery operated and is compatible for use Pura NO/LOC ultraviolet water filtration systems. This 120 volt UV alarm is also known by part number 36001021.
PURA Audible UV Filter Alarm - 120v For NO/LOC specifications: