A syphon in a cistern is used to create a vacuum, to transport water from the cistern to the pan, and C hooks connect the syphon to the lever arm. These Small & Large C Hooks are a small, inexpensive item that is integral to the workin…View more
A syphon in a cistern is used to create a vacuum, to transport water from the cistern to the pan, and C hooks connect the syphon to the lever arm. These Small & Large C Hooks are a small, inexpensive item that is integral to the working of your cistern.