Pentair Autofill White | T40BW
Pentair
SKU: T40BW
Pentair T40BW AutoFill Automatic Water Filler – White Lid with Side-Mounted Float Valve
The Pentair T40BW AutoFill is an automatic pool water level control designed for standard in-ground pools. It uses a simple, reliable side-mounted float valve to monitor the pool’s water level and add water as needed, helping prevent low-water conditions that can lead to pump damage, loss of prime, and poor skimmer performance.
Key Features
- Part Number: T40BW
- Product Type: Automatic water filler / water leveler (AutoFill)
- Float Valve: Side-mounted float valve (mechanical level control)
- Lid Color: White
- Purpose: Maintains a more consistent pool water level automatically
Why This Part Matters
- Helps protect pumps and skimmers from running under low-water conditions
- Reduces day-to-day manual topping off (especially during hot, windy, or dry weather)
- Helps keep skimming and cleaner performance consistent by maintaining proper waterline height
Common Reasons to Replace
- AutoFill no longer shuts off reliably (overfilling)
- AutoFill no longer opens when the water drops (low water level issues)
- Cracked housing or damaged lid/deck components
- Float valve sticks, leaks, or is worn from age or debris
Installation Notes
- Typically installed in the deck near the pool, tied into a dedicated water supply line.
- Water level is adjusted by setting the float height per the unit’s adjustment mechanism.
- For best results, verify you have a proper overflow/drain path so the pool cannot overfill during heavy rain or a valve issue.
- If you are not familiar with plumbing local code requirements, installation is best handled by a qualified pool professional.
Related Products
- Search: Pentair T40BW
- Search: Pentair AutoFill
- Search: Automatic Water Fillers
- Search: Pool Water Levelers
- Search: Pool Overflow / Drain Fittings
- Search: Silicone Pool Lubricant
Installation & Maintenance Tips
- Check the AutoFill canister periodically and remove leaves/sand that can interfere with float movement.
- If the unit is slow to fill, confirm your supply valve is fully open and the supply line/strainer (if used) is not clogged.
- If the unit overfills, shut off the supply line and inspect for a stuck float or debris in the valve.
- Keep your pool waterline in the recommended range for proper skimmer function—consistent water level improves circulation and surface cleaning.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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