No it's if it can drop into the toilet bowl and siphon water from there into the freshwater supply. There's a rule for not fitting handheld showers where they can drop into the loo but people forget when retrofitting bum guns.
Surely you can fit a non return valve to the supply. The same way that is required with mixer taps to prevent cross contamination.
@Bobbo started
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No it's if it can drop into the toilet bowl and siphon water from there into the freshwater supply. There's a rule for not fitting handheld showers where they can drop into the loo but people forget when retrofitting bum guns.