Pentair Automatic Feeder Tubing 5 8" OD x 1 2" ID 100ft (R172093) potterbrumfield this replacement control helps support this replacement control helps support dependable multi pump spa operation and contributes to more stable overall system performance The application reference gives this cartridge practical value because cartridge replacement works best when the part is matched to the original filter family design The correct tubing size helps maintain proper connections and supports consistent system performance The Pentair Automatic Feeder Tubing 5 8" OD x 1 2" ID 100ft (R172093) is replacement tubing for compatible Pentair automatic chemical feeder installations