CAT 5500 pH ORP Temp TDS NaCl Professional Remote Salt Controller Package Cellular Custom Life Ring With Symbols This is a SkimSaver Lid'l This is a SkimSaver Lid'l Seal Kit AG1090 which protects from freeze damage most aboveground 6 inch opening skimmers including Hayward SP1090 A tjreaded bushing is provided at the top the CAT 5500 comes pre mounted on a PVC backboard with the Professional Package which includes a machined acrylic flow cell and a rotary flow switch The Hayward CAT 5500 CELL Professional Salt Controller Package is a Cellular enabled automated controller that allows you to monitor and control pH