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Pool Chemical Controller Pressure Switch filter-length_31 1/8 inches This is a Pentair BoardThe Interlock Pressure Switch by Rola Chem is a pool chemical controller pressure switch. It will maximize your protection from chemical exposure. It works to prevent harmful chemicals from being pumped into the circulation line. The Interlock Pressure Switch also acts as a secondary control system to shut power off to the controller should there be a malfunction. It will bring its operations to a halt. Best of all, it is compatible with any automated