IDL-A952501NU Cartridge replacement

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 4 years ago by Kevin Baker, Dudley
They are both the same, the gears turn them in opposite directions so the cartridges are the same.

Answered 4 years ago by Barrie Seabright

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