Amazon.com: AppliaFit Clamp O-Ring Compatible with Pentair 39010200 for Select Clean & Clear Plus, FNS Plus and Quad DE Series Pool and Spa Filter Tanks - Also Compatible with 39010200Z (2-Pack) :
O-Rings Material Comparison | Phelps Industrial Products
Amazon.com: AppliaFit 25” Cord O-Ring Compatible with Pentair 24850-0009 for Select Pentair Sta-Rite System 3 Filters (1-Pack) : Patio, Lawn & Garden