The Hydrotech 36003034 is the correct replacement quartz sleeve for the following water filter systems:
The Pura #11 Quartz Sleeve for Addon-1 and UVB Series is a replacement quartz sleeve for the Pura UV Addon-1 & UV-1 Series water filtration systems. This Pura quartz sleeve offers thermal protection for your UV-1 bulb against damage or contact with water. This UV quartz sleeve ensures proper water purification for your UV Addon-1 or UV-1 series system. When replacing your UV Addon-1 & UV-1 filters be sure to clean and inspect the #10 quartz sleeve, and replace when damaged.
Pura #11 Quartz Sleeve for Addon-1 and UVB Series specifications: