Pentair Autofill, Gray | T40BG Natural Chemistry Listed size is 2 inch

Listed size is 2 inch for proper replacement matching

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

The part number 400-4000 describes a Union Fitting that connects two 1-1/2 in socket ends

Their service kits support ongoing maintenance and repair

Households with young children or curious pets who want an extra safety layer when the pool is not in use

Pentair Autofill, Gray | T40BG Natural Chemistry Listed size is 2 inchWhat 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