Macdee Metro Oblong Cistern Siphon 7.5 inch CME WRAS Approved DIY Fit. Ideal for use in standard size cisterns. Easy to remove upper section allowing easy maintenance. Flush volumes can be varied between 6/7/9 litres. 7.5" siphon / C-Link 2.25" WRAS Approved. Manufacturer: Derwent Macdee.