Pentair Autofill, Gray | T40BG Natural Chemistry 5 ft and 21 ft

5 ft and 21 ft by 43 ft—are designed to fit standard rectangular layouts

Listed size is 2 inch for proper replacement matching

Upgrade your spa or pool with the CG Air 9

939 Install Note

Pentair Autofill, Gray | T40BG Natural Chemistry 5 ft and 21 ftWhat This Part Is Used For The Pentair T40BG Autofill Gray maintains proper pool water level automatically. It compensates for evaporation through a mechanical float system. Why This Part Matters Consistent water level prevents suction issues and equipment strain. An autofill reduces manual filling and stabilizes operation. It supports reliable skimmer and pump performance. Key Features and Specifications Pentair manufacturer part number: T40BG