Metal Gutter Drain Funnel 130mm . STEEL . Anthracite and Black Metal Gutter Drain Funne 130.Colours : Anthracite RAL 7016 and Black RAL 9005 (others available on request) D=86.5 . Our steel gutters are made of high quality steel, coated with four protective layers: zinc,passivation, undercoat and organic coating. Steel material coating applies to both the outside and inside of the gutter. Thanks to the protective layers, the steel gutter system has greater resistance to harmful weather conditions and resistance to mechanical damage.This is guaranteed by the longest warranty available on the market .Please get in touch for full Price list and design support.