Autotrol Magnum IT 1040692 Valve Disc (Flapper) Kit (Kit Clappets Magnum)

The 1040692 is the valve disc, or flapper, kit fitted inside the piston and spacer stack of the Autotrol Magnum IT-742 control valve, commonly referred to as the clappets. These discs open and close specific ports as the valve steps through each stage of regeneration, and on the commercial-duty Magnum IT valve they see a higher cycle count and higher flow than domestic valves. Constant flexing and exposure to mineral scale eventually hardens or splits the discs, or weakens their retaining springs, so they stop sealing and water finds a path it shouldn't. WrekinWater stocks this genuine-spec disc kit to renew the piston internals on the Magnum IT-742 valve.

Technical specifications

Symptoms that mean you need this part

• Water continues to run to drain in normal service position after a regeneration has completed
• Water quality after the softener drops even straight after a fresh regeneration, suggesting water is bypassing the resin bed
• You can hear or see water flowing to drain outside of the scheduled regeneration cycle
• The valve is in commercial use with a high cycle count and the discs have never been renewed

Why it fails / why it matters

The Magnum IT-742 valve's regeneration sequence depends on the flapper discs, or clappets, in the piston and spacer stack opening and closing the correct ports at each stage, sealed by their retaining springs. Because this valve is built for commercial-duty flow and regeneration frequency, the discs see far more cycles than a domestic softener valve, and over time they harden, split, or the springs weaken so the discs no longer seat fully. That leaves a permanent leak path to drain or lets water bypass the resin bed even in normal service, and renewing the discs and springs as a kit restores correct sealing at every stage.

Why buy this from WrekinWater

WrekinWater has supplied Autotrol and Pentair valve components to installers and commercial engineers for over 15 years from its Bettisfield, Shropshire base, and stocks the full range of Pentair Fleck, Autotrol, Clack and Kinetico parts including the Magnum commercial range. The business is rated Excellent on Trustpilot and has served more than 50,000 customers who need commercial softener downtime kept to a minimum.

How to fit it

1. Isolate the softener at the bypass valve and relieve pressure before opening the control valve
2. Remove the control valve end cap or piston retaining clip following the Magnum IT-742 valve's service instructions
3. Withdraw the piston and spacer stack and identify which flapper discs are worn, split or hardened
4. Fit the new 1040692 discs and springs to each spacer in the same orientation as the originals
5. Reassemble the piston and spacer stack, checking each disc moves freely and seats correctly
6. Refit the end cap, restore the mains supply, and run a manual regeneration to confirm no water runs to drain in service