Non return valves

Does this cartridge have ‘built-in’ non return valves. My Mira Discovery External Mixer shower is back filling my hot water tank from the shower cold feed when the shower is on and the mixer level set to mid-range temperature.
Asked 3 years ago by Phil Summers-Breeze, Gloucester
Not that I know of, but there are none in the elbows, so it is likely that the cartridge is the cause of the fault.

Answered 3 years ago by Barrie Seabright

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