so if youve been to south east asia, youre probably familiar with a toilet hose, or handheld bidet
washing vs smearing seems pretty straight forward to me so im keen on installing one
so from what ive read, a check valve / one way valve / non return valve will comply in Aus and Asia, but in NZ an AVB (atmospheric vacuum breaker) which provides at least a 25mm air gap is required ...
does anyone know much about this? im comfortable with a (lot cheaper) check valve as long as its going to prevent backflow contamination