Pentair 3/8″ MPT Brass Autofill Float Valve | T26
Pentair
SKU: T26
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AutoFill Automatic Water Filler
Not sure it fits?
See this part on the interactive diagram
AutoFill Automatic Water Filler
Pentair T26 Brass 3/8″ MPT Autofill Float Valve
The Pentair T26 is a brass autofill float valve designed for automatic water-level control in pools and spas. It replaces or upgrades the float-valve assembly in autofill canisters, helping maintain proper water level without manual topping up.
Key Features
- 3/8″ male-pipe-thread (MPT) inlet — compatible with standard autofill canisters and plumbing fittings.
- Durable brass body — resistant to corrosion from pool chemicals and weather exposure for long-term reliability.
- Self-adjusting float mechanism — automatically stops water flow once the water level reaches the preset height, preventing overflow.
- Simple replacement or upgrade option for existing autofill systems — installs directly with minimal plumbing or mechanical changes.
Specifications
- Manufacturer: Pentair
- Model / Part Number: T26
- Connection Type: 3/8″ Male Pipe Thread (MPT)
- Material: Brass
- Function: Automatic water-level maintenance / autofill float valve
- Typical Use: In-ground pools, spas, and pools equipped with automatic water filler systems
When & Why to Use T26
Use the T26 float valve when you want to automate water-level maintenance — ideal if the pool water drops due to splashout, evaporation, or backwash procedures. It helps protect pool equipment (pumps, heaters, skimmers) from running low on water and reduces the need for frequent manual water top-offs.
Installation & Maintenance Tips
- Shut off the water supply before installation to avoid leaks.
- Ensure the MPT connection threads are clean and properly sealed (use thread sealant or plumber’s tape if needed for a leak-free fit).
- Adjust the float height per instructions so the water level lands at the desired point after fill.
- Test the valve by triggering a refill after water loss (e.g. after backwash or splashout) — confirm that it shuts off correctly when water reaches the set level.
- Periodically rinse and inspect the valve for mineral buildup or corrosion — replace if the float becomes stuck or leaks develop.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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