Pentair Autofill with Fluidmaster Valve, Dark Gray | T40FDG PresAir This part is replaced to

This part is replaced to restore proper filtration and pump performance

and any area where gas grills are prohibited

This kit includes a 1 gallon container and a 1 quart container of primer to support complete coverage on typical pool surfaces

Flow is reduced because the basket is damaged or collapsed

Designed for professional service use and in-ground pool protection

Pentair Autofill with Fluidmaster Valve, Dark Gray | T40FDG PresAir This part is replaced toWhat This Part Is Used For The Pentair T40FG Autofill with Fluidmaster Valve Dark Gray maintains consistent pool water level. It automatically replaces evaporated water through a controlled valve system. Why This Part Matters Proper water level protects pumps from air lock and cavitation. An autofill minimizes manual maintenance and stabilizes system performance. It also helps maintain consistent waterline appearance. Key Features and Specifications