Pentair Bottom Locking Flange

The Pentair Bottom Locking Flange (Part #R172370) is a genuine replacement component designed specifically for secure attachment within the housing of Pentair Rainbow Dynamic Series pool and spa cartridge filters, including the Dynamic Series II, III (RTL/RCF models), and IV (DFM/DFML models). Acting as a critical stabilization and locking mechanism at the base of the canister assembly, this round plastic collar ensures that internal filter components remain tightly sealed and perfectly aligned under system water pressure.

As a lightweight molded plastic part, it has an actual product weight of approximately 0.32 pounds (roughly 5.12 ounces). When packaged alone for distribution, its shipping weight typically ranges between 0.5 and 3.1 pounds depending on the bulk of the box and protective materials used.