Pentair R172224XZ Black Drain and Vent ValveThe Pentair R172224XZ is a black drain and vent valve designed as a replacement part for Pentair Rainbow Dynamic Series I, II RTL RCF, and III RTL RCF inline pool spa cartridge filter models. It is constructed for compatibility with models such as RDC 25, RDC 25S, RDC 50, and is also applicable for High Capacity Automatic Feeder models HC 3315, HC 3330, HC 3340. This valve plays a role in managing air flow and drainage within these systems.