This question is regarding Ideal Standard Dx M25x1 1/4Turn Cartridge Cl Open - A952501nu

This question has not been answered as I have the same problem with this product? I’ve just ordered and received a pair of IDL-A952501NU cartridges for our Trevi Therm - Pre 1997 (Red Override Button). Thanks for the quick service. However, I have a query on how they work? The central spindle gear moves on both cartridges, but as both cartridges are anti-clockwise off clockwise on, they will never both be off or on? Am I missing something, or do they need to be altered to change orientation in some way?
Asked 3 years ago by Paul Gage, Bury St. Edmunds
The way the gear box works solves this problem

The thing to do to make life easier is to make sure both cartridges are fully open or fully closed before fitting..

If you are not sure then look at the base of the cartridge and make sure that they both look the same

Answered 3 years ago by George Thomson

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