For the paddle group, this is the large lower o-ring, three per group. For the GS3 drain connection three are also used. 2.62 mm thick with an internal diameter of 21.89 mm.
Attention CA Residents: Prop 65 Warning
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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