Check the listing for details. 5 PC Bulk R172009 Cap O-Ring Replacement for Pentair Rainbow Pool/ Spa Feeder. Condition: New. Listed at 8.99 USD. ● Genuine Pentair brand replacement parts ● O-ring for cap ● Used with the following Pentair Automatic Feeders: Model 300, 302, 300-19, 300-29, Model 300-29X, Model 320 & Model 322 ● 5 pieces O-ring ● This cap o-ring is designed to be used with Pentair standard and high square feet module cartridge filters and is also compatible with Pentair Rainbow automatic chlorine/bromine pool and spa feeder models 300, 302, 300-29X, 320, 322. Also fits Pentair Rainbow automatic chlorine/bromine feeder extensions. .