Going to show how to replace the main seal on n electric show stabilizer flow valve this would leak quite badly if damaged it would also not engage the pressure microswitch to turn shower on electrically which is good thing as there would be lot of water leaking from this seal if it was damaged as its full on mains water pressure, its can also leak water onto the solenoid coil causing it to fail turning water off blowing fuses and other bad things.
Need new Main seal please try on Ebay UK here
Check all seals on the valve as there can be a few
Undo all Posidrive No2 screws holding pressure switch mechanism in place
Beware of the springs and make sure you now which way everything goes back
You may need to prise the seal out if its an old valve , next just fit the new one
assemble correctly and screw up the 4 screws not too tight
as its only plastic
see this process in video below
**I say solenoid valve at beginning but mean stabilizer valve**
See below video on how to remove the stabilizer flow valve from electric shower unit
Need new main seal, these are good quality replacements i have used for years now so i know they are good.
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