Polaris 3900 Sport SuperBag | 39-310 Electrical Boxes & Enclosures inspect the mating threads on

inspect the mating threads on the filter port for any cracks or cross-threading

If you need less testing

the cleaner loses grip and climbing ability

confirm the fault is isolated to the thermistor — check for error codes in your heater's control panel that specifically indicate a temperature sensor fault

Reemay 2033 Pleat Count 151 Top Cap: bar handle

Polaris 3900 Sport SuperBag | 39-310 Electrical Boxes & Enclosures inspect the mating threads onThe Polaris 39 310 SuperBag is a large, double chambered replacement filtration bag designed specifically for Polaris 3900 sport or P39 pressure side vac sweep pool cleaners. The 39 310 SuperBag is gray in color and expands to hold up to 5 liters of large and small debris within the dual zippered chambers, giving almost twice as much debris capacity as a single chamber Polaris bag. Features and Benefits: Double chambered filtration bag with 5 liters