Our Cast Iron Effect Deepflow guttering comes in 4m lengths, the most common length for gutters in the UK.Made by the UK market leaders FloPlast, our deepflow gutter system nominally measures 115mm across the top and is 75mm deep. As it caters for all sizes of roofs and extremes of weather, deepflow is one of our biggest selling options. With its traditional appearance and high capacity and flow rate, our cast iron effect deepflow guttering is guaranteed for 20 years.Deepflow gutter connects to 68mm round downpipe - this diameter is more than adequate to carry away a huge 5 litres per second of rainfall, which is the maximum flow rate for this system.Please watch our overview video below