Pentair Automatic Water Filler T40FDG – Fluidmaster Valve System for Reliable Pool Water Level Control
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The Pentair T40FDG Automatic Water Filler with Fluidmaster valve system delivers reliable, hands‑free water level control for pools and spas. This rugged automatic filler constantly monitors and maintains your pool’s water level by refilling as needed, eliminating the hassle of manual top‑offs and helping protect your pool equipment from damage caused by low water levels.
Featuring a premium Fluidmaster valve mechanism, the T40FDG is engineered for smooth, drip‑free operation and long‑lasting performance in both freshwater and saltwater environments. Its quality construction and precision control make it ideal for residential and commercial pool installations requiring consistent water level maintenance.
Pentair T40FDG Automatic Water Filler Compatibility
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Designed for in‑ground and above‑ground pool installations
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Suitable for use with freshwater and saltwater pools
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Integrates with standard pool plumbing and equipment pads
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Ideal for systems requiring automatic water level control
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Works with Pentair easy‑install water line connections
Frequently asked questions
How do I identify the right replacement valve?
Valves are specified by port size, port count, connection type - slip, threaded or union - and body material. Measure the pipe outside diameter rather than guessing at nominal size, since PVC sizing does not match the physical measurement.
What is the part number for this valve?
Pentair lists this valve under part number T40FDG. Quote T40FDG when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.
Why is my valve leaking or hard to turn?
Stiff operation and weeping around the stem usually mean dried-out or chemically degraded seals. Many valve bodies can be rebuilt with a service kit rather than replaced outright, which avoids cutting into the plumbing.
How do I confirm this fits my equipment?
Match the part number stamped on the component you are replacing, or look it up in the parts list for your Pentair equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.
Can I automate this valve?
Diverter valves in this style commonly accept a valve actuator so an automation system can switch them, but the actuator and its mounting hardware are separate items. Confirm the valve body is a type the actuator is rated to drive before ordering.
Is there a warranty on this valve?
It carries the standard Pentair manufacturer warranty. The terms are set by Pentair, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.