The 410867 O-ring is a replacement part for the quartz sleeve and retaining nut used with the VIQUA VH150, VH200, VH410, and most other VIQUA systems. The O-ring has a diameter of 1.05″ and a thickness of 0.09″.
The O-ring is also a replacement for Sterilight S5Q, S8Q and S12Q, SC-200, SC-320, and SC-600 UV systems.