Fleck 24234 - 9000 series Piston assembly upper DF (Downflow)

The Fleck 24234 upper piston assembly is the genuine replacement part for downflow-configured Fleck 9000 series water softener control valves, supplied by WrekinWater for households and commercial sites where the original piston has worn and is letting water leak to drain or causing the valve to hesitate mid-cycle. It's a direct fit for the upper position on DF valve bodies.

Technical specifications

Symptoms that mean you need this part

• Water continues running to drain well after the regeneration cycle should have finished
• The valve hesitates, stalls or grinds part-way through a regeneration
• The old piston shows visible scoring, pitting or worn seal grooves when removed
• You notice reduced water pressure or a knocking sound as the valve indexes between positions

Why it fails / why it matters

The upper piston in a 9000 series downflow valve directs water between service, backwash, brine draw and rinse positions as the camstack rotates. It's under constant sliding friction against its seal stack, and mineral-laden or high-iron water accelerates wear on the piston's surface and grooves, so it gradually stops sealing tightly at each port - letting water bypass between cycles, or in more severe cases causing the valve to bind and stall.

Why buy this from WrekinWater

WrekinWater has served more than 50,000 customers over 15 years from our base in Bettisfield, Shropshire, and as UK Company No. 11000488 we stock genuine Pentair Fleck parts alongside Autotrol, Clack, Kinetico and other major brands, rated Excellent on Trustpilot. Ordering the correctly specified upper piston for a downflow 9000 series valve avoids the compatibility errors that come from generic listings.

How to fit it

1. Turn off the water supply and switch the control valve to bypass
2. Remove the valve's top retaining cap or clip to access the upper piston
3. Carefully withdraw the worn upper piston assembly from the valve body
4. Fit the new 24234 piston, checking the orientation matches the original before seating it fully
5. Refit the retaining cap or clip securely
6. Restore the water supply, take the valve off bypass, and run a manual regeneration to confirm smooth indexing with no leaks