a container treatment machine with a tank and spaced - apart valve housings , wherein a pressure - resistant delivery pipe having a curved section is provided between the tank and each valve housing directly or via an intermediate flow regulator , the delivery pipe being composed , at least in its curved section , of a hard plastic which is pressure - and temperature - resistant , and is acid - and alkali - resistant and permissible for foodstuffs , in particular polytetrafluoroethylene .